U.S. patent application number 14/052300 was filed with the patent office on 2015-04-16 for write pole with varying bevel angles.
This patent application is currently assigned to Seagate Technology LLC. The applicant listed for this patent is Seagate Technology LLC. Invention is credited to Kirill Rivkin, Zhe Shen, Wei Tian, Jianhua Xue, Huaqing Yin.
Application Number | 20150103439 14/052300 |
Document ID | / |
Family ID | 52809451 |
Filed Date | 2015-04-16 |
United States Patent
Application |
20150103439 |
Kind Code |
A1 |
Yin; Huaqing ; et
al. |
April 16, 2015 |
WRITE POLE WITH VARYING BEVEL ANGLES
Abstract
A magnetic element can have at least a write pole configured
with a write pole tip that has a tip surface oriented at a first
angle with respect to an air bearing surface (ABS), a first bevel
surface extending from the ABS and oriented at a second angle with
respect to the ABS, and a second bevel surface extending from the
ABS and oriented at a third angle with respect to the ABS. The
first, second, and third angles may be configured to be different
and non-orthogonal to each other.
Inventors: |
Yin; Huaqing; (Eden Prairie,
MN) ; Tian; Wei; (Eden Prairie, MN) ; Shen;
Zhe; (Lakeville, MN) ; Rivkin; Kirill;
(Bloomington, MN) ; Xue; Jianhua; (Maple Grove,
MN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Seagate Technology LLC |
Cupertino |
CA |
US |
|
|
Assignee: |
Seagate Technology LLC
Cupertino
CA
|
Family ID: |
52809451 |
Appl. No.: |
14/052300 |
Filed: |
October 11, 2013 |
Current U.S.
Class: |
360/122 |
Current CPC
Class: |
G11B 5/1871 20130101;
G11B 5/1278 20130101; G11B 5/3116 20130101 |
Class at
Publication: |
360/122 |
International
Class: |
G11B 5/187 20060101
G11B005/187 |
Claims
1. An apparatus comprising a write pole core having a write pole
tip comprising a tip surface oriented at a first angle with respect
to an air bearing surface (ABS), a first bevel surface extending
from the ABS and oriented at a second angle with respect to the
ABS, and a second bevel surface extending from the ABS and oriented
at a third angle with respect to the ABS, a first bevel layer
contacting the write pole core, the first bevel layer comprising a
different material than the write pole core and having a third
bevel surface oriented at a fourth angle with respect to the ABS,
the first, second, third, and fourth angles being different and
non-orthogonal to each other.
2. The apparatus of claim 1, wherein the first bevel surface
contacts and extends from the tip surface.
3. The apparatus of claim 1, wherein the second bevel surface
contacts and extends from the tip surface.
4. The apparatus of claim 1, wherein a fourth bevel surface
corresponds to a second bevel layer contacting the write pole
core.
5. The apparatus of claim 1, wherein the first and third bevel
surfaces are positioned uptrack from the tip surface and the second
bevel surface is positioned downtrack from the tip surface.
6. The apparatus of claim 1, wherein a yoke contacts the write pole
distal the ABS and proximal the second bevel surface.
7. The apparatus of claim 6, wherein the yoke has an ABS facing
front surface having the first angle.
8. The apparatus of claim 1, wherein the third bevel surface
contacts and extends from the second bevel surface.
9. The apparatus of claim 1, wherein a second bevel layer has a
fourth bevel surface oriented at a fifth angle with respect to the
ABS, the fourth and fifth angles being the same with respect to the
ABS.
10. The apparatus of claim 1, wherein a second bevel layer has a
fourth bevel surface oriented at a fourth angle with respect to the
ABS, the fourth and third angles being different and non-orthogonal
with respect to the ABS.
11. The apparatus of claim 1, wherein the first bevel layer is
separated from the write pole core and ABS.
12. The apparatus of claim 1, wherein the see-end third bevel
surface is displaced from the ABS by a first distance.
13. The apparatus of claim 12, wherein a third fourth bevel surface
is displaced from the ABS by a second distance that is greater than
the first distance.
14. A writing element comprising a write pole having a write pole
tip comprising a tip surface oriented at a first angle with respect
to an air bearing surface (ABS), a first bevel surface extending
from the ABS at a leading edge of the write pole tip and oriented
at a second angle with respect to the ABS, and a second bevel
surface extending from the ABS at a trailing edge of the write pole
tip and oriented at a third angle with respect to the ABS, a first
bevel layer contacting the write pole core, the first bevel layer
comprising a different material than the write pole core and having
a third bevel surface oriented at a fourth angle with respect to
the ABS, the first, second, and third, and fourth angles being
different and non-orthogonal to each other.
15. The writing element of claim 14, wherein the first bevel layer
contacts the write pole core downtrack from the tip surface, a
second bevel layer contacts the write pole core uptrack from the
tip surface and has a fourth bevel surface oriented at a fifth
angle with respect to the ABS, the third and fourth angles being
different and non-orthogonal to the first, and second angles
16. The writing element of claim 15, wherein third and fourth bevel
surfaces are each displaced from the ABS by a common distance.
17. The writing element of claim 15, wherein third and fourth bevel
surfaces are each displaced from the ABS by different
distances.
18. The magnetic writing element of claim 15, wherein the first,
second, third, and fourth bevel surfaces each face away from the
tip surface.
19. The magnetic writing element of claim 15, wherein the first and
second bevel layers each having a smaller thickness than the write
pole core as measured parallel to the ABS.
20. (canceled)
21. An apparatus comprising: a write pole core comprising a first
material and having a tip surface positioned on an air bearing
surface (ABS), the write pole core having first and second bevel
surfaces respectively extending from the tip surface at different
first and second angles with respect to the ABS; a first bevel
layer comprising a second material, contacting the write pole core,
and having a third bevel surface oriented at a third angle with
respect to the ABS; a second bevel layer comprising a third
material, contacting the write pole core, and having a fourth bevel
surface oriented at a fourth angle with respect to the ABS; a third
bevel layer comprising a fourth material, separated from the write
pole core, contacting the first bevel layer, and having a fifth
bevel surface oriented at a fifth angle with respect to the ABS;
and a fourth bevel layer comprising a fifth material, separated
from the write pole core, contacting the second bevel layer, and
having a sixth bevel surface oriented at a sixth angle with respect
to the ABS, the first material being different than the second,
third, fourth, and fifth materials.
Description
SUMMARY OF THE INVENTION
[0001] Assorted embodiments provide at least a write pole
configured with a write pole tip that has a tip surface oriented at
a first angle with respect to an air bearing surface (ABS), a first
bevel surface extending from the ABS and oriented at a second angle
with respect to the ABS, and a second bevel surface extending from
the ABS and oriented at a third angle with respect to the ABS. The
first, second, and third angles may be configured to be different
and non-orthogonal to each other.
BRIEF DESCRIPTION OF THE DRAWINGS
[0002] FIG. 1 is a block representation of an example data storage
system configured and operated in accordance with various
embodiments.
[0003] FIG. 2 illustrates a block representation of a portion of an
example writing element capable of being used in the data storage
system displayed in FIG. 1.
[0004] FIG. 3 shows a block representation of a portion of an
example write pole configured in accordance with some
embodiments.
[0005] FIG. 4 displays a block representation of a portion of an
example magnetic writing element constructed and operated in
accordance with various embodiments.
[0006] FIG. 5 is a block representation of a portion of an example
write pole configured in accordance with assorted embodiments.
[0007] FIG. 6 illustrates a block representation of a portion of an
example write pole constructed and operated in accordance with
various embodiments.
[0008] FIG. 7 shows a block representation of a portion of an
example write pole configured in accordance with some
embodiments.
[0009] FIG. 8 plots example operational data for a write pole tuned
in accordance with assorted embodiments.
[0010] FIG. 9 maps an example write pole fabrication routine
carried out in accordance with various embodiments.
DETAILED DESCRIPTION
[0011] Modern computing devices have advanced to smaller sizes and
more powerful computing capabilities that have allowed for the
proliferation of greater amounts of data across wired and wireless
networks. Data storage devices have progressed to accommodate such
advancement with higher data capacities, faster data access, and
reduced form factors. However, decreasing the physical size of
various data storage components like data write poles and data
reading resistive laminations can degrade performance as magnetic
operation is more volatile as such reduced dimensions. Hence, there
is a continued industry demand for reduced form factor data storage
devices capable of optimized performance associated with consistent
magnetic operation.
[0012] These issues have rendered a magnetic element with at least
a write pole configured with a write pole tip that has a tip
surface oriented at a first angle with respect to an air bearing
surface (ABS), a first bevel surface extending from the ABS and
oriented at a second angle with respect to the ABS, and a second
bevel surface extending from the ABS and oriented at a third angle
with respect to the ABS with the first, second, and third angles
being different and non-orthogonal to each other. The ability to
tune bevel surfaces for size and orientation with respect to the
ABS allows write flux to be focused along the tip surface to
optimize write pole performance despite reduce write pole
dimensions. Further, tuning the different bevel surface angles can
optimize write field gradient to increase the precision and
accuracy of the write pole.
[0013] While a write pole having multiple tuned bevel surfaces can
be practiced in an unlimited variety of data storage environments,
FIG. 1 generally illustrates an example data storage system 100
where a tuned write pole can be employed in accordance with various
embodiments. The data storage environment may consist of one or
more data storage devices 102 configured with at least one
transducing portion 104 that is controlled by a local controller
106 and accesses data temporarily or permanently stored in a local
memory 108. As shown, the transducing portion 104 has a transducing
head 110 over a magnetic storage medium 112 that is capable of
storing programmed bits 114.
[0014] The storage medium 112 is attached to and controlled by a
spindle motor 116 that rotates to produce an air bearing surface
(ABS) 118 on which the transducing head 110 flies to access
selected data bits 114 from the medium 112. The transducing head
110 can include one or more transducing elements, such as a
magnetic writer and magnetically responsive reader, which operate
to program and read data from the storage medium 112, respectively.
While not limiting, a magnetic data writing element portion of the
transducing head 110 is shown in FIG. 1. The writing element can
generate magnetic flux from a coil and emit predetermined amounts
of the magnetic flux from a write pole 120 to a return pole 122
through the storage medium 112 in a circuit to impart a polarity
that programs at least one data bit 114.
[0015] Operation of the data storage device 102 may be conducted
concurrently and autonomously with local and remote equipment such
as other local data storage devices interconnected in a redundant
array of independent discs (RAID) and data storage devices 124
connected to the data storage device 102 via a network 126 and
access via appropriate protocol. The wired or wireless network 126
can further provide access to other forms of temporary and
permanent data memory 128 as well as computing capabilities via one
or more remote processors 130. The unlimited variety of local and
remote computing configurations allows the data storage environment
100 to be adapted to a diverse array of applications.
[0016] FIG. 2 displays a block representation of a portion of an
example writing element 140 constructed and operated in accordance
with some embodiments. The writing element 140 is illustrated with
a write pole 142 that is configured with a yoke 144 and main write
pole 146. The main write pole 146 has write pole tip 148 shaped
with sidewalls 150 tapered at a common angle .theta..sub.1 that
funnels magnetic flux to an ABS portion 152. Tuning of the
sidewalls 150 can produce a predetermined ABS portion width 154
along the Y axis that is smaller than the pole width 156 and
focuses magnetic flux emission to approximately the portion width
154.
[0017] As the areal density of data bits on data medium 158
increases to provide greater data capacity, the bit length 160
associated with data tracks 162 containing one or more data bits
decreases. Such reduced track spacing 160 emphasizes the accuracy
of function of the write pole tip 148 and specifically the ABS
portion 152. That is, the sidewalls 150 and ABS portion 152 are
tuned in assorted embodiments to match or have a smaller portion
width 154 compared to the bit length 160 so that emitted magnetic
flux programs only the data bit below the ABS portion 152 and not
adjacent data bits. However, reduction of bit length 160 can
correspond with minimized ABS portion width 154 that can restrict
magnetic flux emission from the write pole 142 and degrades data
bit quality and accuracy. Hence, the magnetic efficiency of the
write pole tip 148 is emphasized in reduced portion width 154
configurations.
[0018] Accordingly, the write pole 142 can be configured to
optimize data bit quality accuracy and magnetic flux delivery in
reduced portion width 154 environments, such as sub-100 nm regimes.
FIG. 3 is a block representation of a portion of example write pole
170 constructed in accordance with various embodiments to provide
optimized magnetic flux delivery. The write pole 170 has a write
pole core 172 that continuously contacts a bevel layer 174 uptrack
from a tip surface 176 along the Y axis. The bevel layer 174 also
contacts a yoke 178 that is placed further uptrack from the write
pole core 172 and tip surface 176. The tip surface 176 is resident
on the ABS and is configured to be substantially parallel to the
ABS along the Y axis while being the apex for first 178 and second
180 bevel surfaces that define the write tip 182 along with the
third bevel surface 184 of the bevel layer 174.
[0019] The tuning of the various surfaces of the write pole tip 182
can deliver greater magnetic flux to the trailing edge 186 of the
write pole 170, which can promote stronger writeability, larger
magnetic field gradient, better magnetic flux efficiency, and
improve magnetic field dynamics to provide optimized data recording
performance. While orienting the first 178 and second 180 bevel
surfaces at a common angle with respect to the ABS and Y axis can
funnel some magnetic flux to the tip surface 176, miniscule data
bit dimensions can render flux emitted from the entire tip surface
176 as inaccurate and lacking sufficient magnetic field. Thusly,
the bevel surfaces 178 and 180 can be tuned to each face away from
the tip surface 176 while having different angles .theta..sub.1 and
.theta..sub.2 with respect to the Y axis and ABS to focus magnetic
flux on the trailing edge 186 of the tip surface 176, as opposed to
the leading edge 188 that resides uptrack from and passes over data
bits before the trailing edge 186.
[0020] The focus of magnetic flux at the trailing edge 186 of the
tip surface 176 can allow for precise delivery of data bit
programming magnetic fields conducive to sub-100 nm data track
spacing. However, the simple asymmetric configuration about the X
and longitudinal axis of the write pole core 172 may not
sufficiently direct magnetic flux to the tip surface 176. As shown,
the bevel layer 174 and its tuned third bevel surface 184 angled
away from the tip surface 176 and at an orientation .theta..sub.3
that is greater than and non-orthogonal to .theta..sub.1 and
.theta..sub.2 focuses additional amounts of magnetic flux towards
the trailing edge 186, which may be a function of being
contactingly disposed between the magnetic flux carrying yoke 178
and the flux emitting write pole core 172. It should be noted that
the yoke 178 has an ABS facing front surface 190 that is
substantially parallel to the ABS and tip surface 176, but such
configuration is not required or limiting.
[0021] With the multiple different angles .theta..sub.1,
.theta..sub.2, and .theta..sub.3 respectively provided by the bevel
surfaces 178, 180, and 184, the peak effective magnetic field and
perpendicular magnetic field component can be heightened to
optimize magnetic field gradient at transition and magnetic flux
delivery from the trailing edge 186 and optimize data bit quality.
Magnetic flux behavior may further be tuned by adjusting the
thickness of the write pole 170 layers along the Y axis, which
consequently alters the length of the respective bevel surfaces
178, 180, and 184 to optimize magnetic gradient along the
cross-track and Z axis. In the non-limiting example of FIG. 3, the
bevel layer 174 has a thickness 192 that is smaller than the write
pole core thickness 194 to conduct increased amounts of magnetic
flux from the yoke 178 to the write pole core 172 than if the core
thickness 194 was larger than the bevel layer thickness 192.
[0022] While the tuned bevel surfaces 178, 180, and 184 can
efficiently focus magnetic flux to the trailing edge 186 of the tip
surface 176 on the ABS, magnetic fields can unintentionally be
emitted laterally from the write pole core 172. The emission of
magnetic flux from the bevel surfaces 178, 180, and 184 can degrade
write pole 170 performance as errant data bits can be inadvertently
programmed. Accordingly, soft magnetic coercivity materials can be
positioned proximal to, but separated from, the write pole 170 to
reduce the amount and effects of errant flux emission.
[0023] FIG. 4 illustrates a block representation of a portion of an
example data writing element 200 configured in accordance with
various embodiments to have a write pole 202 adjacent to a trailing
magnetic shield 204 on the ABS. The write pole 202 is tuned with
bevel surfaces 206, 208, and 210 the respectively face away from a
tip surface 212 and are oriented at different, non-orthogonal
angles with respect to the Y axis and ABS. The continuous extension
of the first 206 and second 208 bevel surfaces from the tip surface
212 and ABS corresponds with heightened risk of inadvertent flux
emission laterally from the write pole core 214 instead of from the
leading edge 216 of the tip surface 212.
[0024] With the tuned orientation of the leading edge second bevel
surface 208 to a second angle .theta..sub.2 that differs from the
first .theta..sub.1 and third .theta..sub.3 bevel angles, the
trailing shield 204 can have a matching taper surface 218 that
continuously extends from the ABS to beyond the length of the
second bevel surface 208 to catch and dispel magnetic flux emitted
laterally along the Y axis from the write pole core 214. The shape
of the trailing shield 204 can be tuned, as displayed, to be a
closer first separation distance from the second bevel surface 208
at the ABS than a second separation distance from the write pole
core 214 distal the ABS. That is, more non-magnetic insulating
material can be present between the write pole core 214 distal the
ABS than at the ABS to reduce the risk of the leading shield
shunting magnetic flux from the write pole 202.
[0025] The position of the trailing shield 204 uptrack from the
leading edge 216 to which the bevel surfaces 206, 208, and 210
direct magnetic flux can be complemented, in assorted embodiments,
by a magnetic shield positioned downtrack from the leading edge 216
on the ABS. The addition of magnetic shields about the write pole
202 can provide varying degrees of accuracy for the emission of
magnetic flux from the write pole core 214. However, the tuned
shaping of not only the write pole core 214 via the first 206 and
second 208 bevel surfaces but the third bevel surface 210 of the
bevel layer 220 can more efficiently optimize the accuracy and
amount of available magnetic flux in the write pole 202 than
magnetic shields.
[0026] Various embodiments tune the bevel layer 220 in reference to
the size and position of the yoke 222 to deliver magnetic flux
efficiently to the write pole core 214. For example, the angle
.theta..sub.3 of the third bevel surface 210 of the bevel layer 220
and the distance 224 of the bevel layer 220 from the ABS can be
adjusted to focus a predetermined amount of magnetic flux to a
particular portion of the tip surface 212, such as the leading edge
216 or trailing edge 226. The displacement of the bevel layer 220
from the ABS can minimize the risk of unwanted flux emission while
efficiently providing magnetic flux to the write pole core 214.
Similarly, separating the yoke 222 from the ABS by a greater
distance than distance 224 allows for magnetic flux to pass to the
tip surface 212 without inadvertently programming downtrack data
bits.
[0027] FIG. 5 displays a block representation of a portion of an
example write pole 230 constructed and operated in accordance with
some embodiments. As shown, a write pole core 232 continuously
extends from the ABS to a first distance 234 from the ABS and is
configured with a tip surface 236 that positioned on the ABS and
angled to be parallel to the ABS. First 238 and second 240 bevel
surfaces respectively extend from the tip surface 236 and ABS at
different, non-orthogonal angles .theta..sub.1 and .theta..sub.2 to
focus magnetic flux to a trailing edge 242 of the tip surface 236.
In contrast to the write pole 202 of FIG. 4, the leading side first
bevel surface 238 has a longer length and lesser angle with respect
to the ABS than the trailing side second bevel surface 240.
[0028] Further in contrast to write pole 202 of FIG. 4, the yoke
244 contacts the write pole core 232 on the trailing side, opposite
the first 246 and second 248 bevel layers positioned uptrack from
the tip surface 236 on the leading side of the write pole core 232.
Contacting the write pole core 232 with the yoke 244 without an
intervening bevel layer may allow an elevated amount of magnetic
flux to be available at the tip surface 236. However, the
displacement distance 250 of the yoke 244 from the ABS can serve to
throttle magnetic flux, which supports the use of at least one
bevel layer constructed with a material and thickness tuned to
efficiently focus magnetic flux towards a selected portion of the
tip surface 236, such as the trailing edge 242, without unduly
restricting the amount of magnetic flux passing to the write pole
core 232 from the yoke 244.
[0029] Regardless of where the yoke 244 contacts the write pole
core 232, the bevel layers 246 and 248 can individually and
collectively be tuned to optimize magnetic flux delivery and
accuracy of the write pole 230. For a variety of non-limiting
reasons, such as manufacturing complexity and controlled flux
delivery, the bevel layers 246 and 248 can each have bevel surfaces
252 and 254 that share a common bevel angle .theta..sub.3 and
continuously extend from the write pole core 232. By displacing the
first bevel layer 246 a second displacement distance 256 that is
less than the yoke displacement distance 250, magnetic flux can be
focused to the tip surface 236 instead of reaching a
bottleneck.
[0030] The tuning of the bevel layers 246 and 248 can further
incorporate extending each layer beyond the length 234 of the write
pole core 232 from the ABS. As displayed, the first bevel layer 246
can continuously extend from the second displacement distance 256
to a first bevel length 258 from the ABS that overhangs the write
pole core 232 and can be adjusted to tune the manner in which
magnetic flux flows toward the ABS along the core length 234. The
staggering of bevel layer lengths from the first length 234 from
the ABS to the first bevel length 258 from the ABS to the second
bevel length 260 from the ABS may further contribute to elevated
levels of magnetic flux being available at the trailing edge 242 of
the top surface 236.
[0031] With the diverse variety of tuning options in the write pole
230, a range of different data storage environments, like high
areal density, bit patterned media, and small form factor
environments, can be accommodated. However, the position of bevel
layers 246 and 248 on a single selected side of the write pole core
232 is not limiting as a multitude of bevel layers can be utilized,
without restriction, to control the magnetic flux delivery and
accuracy of a writing element.
[0032] FIG. 6 illustrates a block representation of a portion of an
example write pole 270 configured in accordance with various
embodiments to dispose a write pole core 272 between leading 274
and trailing 276 pairs of bevel layers 278, 280, 282, and 284. The
trailing pair 276 of layers are constructed with different
thicknesses 286 and 288, as measured along the Y axis, different
bevel angles .theta..sub.3 and .theta..sub.4, and different
displacement distances 290 and 292 from the ABS. Meanwhile, the
leading pair 274 have a common thickness 294 with different
displacement distances 296 and 298 as well as different bevel
angles .theta..sub.5 and .theta..sub.6.
[0033] Although not required or limiting, the various thicknesses
282, 284, and 290 along with the bevel angles .theta..sub.3,
.theta..sub.4, .theta..sub.5, and .theta..sub.6 can each be
different in assorted embodiments while other embodiments have at
least two thicknesses and bevel angles being the same. The ability
to tune the various bevel layers 278, 280, 282, and 284 for a
plethora of structural characteristics can allow precise control of
magnetic flux saturation and delivery from the write pole core 272.
For example, tuning the leading 274 and trailing 276 pairs of bevel
layers with differing magnetic and non-magnetic materials as well
as with structure that complements the ABS bevel surfaces 300 and
302 and angles .theta..sub.1 and .theta..sub.2 can reduce write
pole core 272 saturation time after programming one or more data
bits and focus the magnetic flux transmission from the yoke 304 to
the trailing edge 306 of the tip surface 308 on the ABS.
[0034] The combination of tuned bevel layers on leading and
trailing sides of the write pole core 272 along with the asymmetric
configuration of the write pole core 272 about its longitudinal
axis that is perpendicular to the ABS can focus magnetic flux to a
selected uptrack, leading 310 surface of a bevel layer or
downtrack, trailing edge 306 of the core 272 to accommodate the
write pole 270 to a variety of different data storage
environments.
[0035] FIG. 7 displays a portion of another exemplary write pole
320 configured in accordance with some embodiments to have both
bevel layers 322, 324, and 326 and a yoke 328 on a common leading
side of the write pole core 330. As shown, the write pole 320 has
an asymmetrical write pole core 330 construction on the ABS with
first 332 and second 334 bevel surfaces having different angles
.theta..sub.1 and .theta..sub.2, lengths, and extension distances
from the ABS. Displacing the first bevel layer 322 from both the
first bevel surface 332 and from the ABS can complement the
selected bevel angle .theta..sub.3 and bevel length to direct
optimize magnetic flux gradient and saturation at the tip surface
336.
[0036] The addition of the second 324 and third 326 bevel layers
between the yoke 328 and first bevel layer 322 can further tune
magnetic flux behavior in the write pole core 330 by laterally
separating the first bevel layer 322 from the yoke 328 and ABS
according to the bevel angle .theta..sub.4 and thickness of the
bevel layers 324 and 326. Various embodiments configure the
displacement distances 338, 340, and 342 of the bevel layers 322,
324, and 326 and yoke 328 in consideration of the respective
layer's thicknesses and materials to tune the amount of magnetic
flux present at the trailing edge 344 of the tip surface 336.
[0037] It should be noted that the various write pole core, bevel
layer, and yoke configurations displayed in FIGS. 3-7 are not
exclusive or limiting and can be combined, parsed, and altered at
will to provide magnetic flux operation that accommodates a
particular data storage environment. However, it can be appreciated
that the number of bevel layers, bevel angles, layer thicknesses,
and ABS displacement distances can all be tuned to optimize the
data bit quality and performance of a write pole.
[0038] FIG. 8 plots example operational data that corresponds with
a tuned bevel surface and bevel layer configuration in accordance
with assorted embodiments. Solid line 350 shows how magnetic field
gradient can change along the cross-track direction, such as a 2 dB
overwrite improvement, depending on the cross-track position from a
write pole core longitudinal axis when a single tuned bevel layer
contacts a write pole core. In contrast, segmented line 352
displays how the incorporation of a second tuned bevel layer
reduces the magnetic field gradient for a majority of positions
along the cross-track direction.
[0039] Solid line 354 and segmented line 356 further illustrate the
field gradient perpendicular to the ABS along the cross-track
direction, respectively. It can be appreciated that the field
gradient in the cross-track direction increases when a second bevel
layer is incorporated. While not comprehensive of the diverse
variety of bevel layer and write pole core configurations, the
difference between lines 350 and 352 as well as lines 354 and 356
respectively convey how tuned bevel layers can optimize data bit
quality and performance, especially in high areal density, small
form factor data storage devices.
[0040] Although a write pole with tuned bevel layers can be
manufactured in any number of different manners, FIG. 9 provides a
flowchart of an example write pole fabrication routine 360 that is
carried out in accordance with assorted embodiments to construct
optimized write poles that may be similar or dissimilar from the
write poles of FIGS. 3-7. The routine 360 can begin with the
formation of a write pole core in step 362 that involves depositing
a continuously layer of magnetic material with a predetermined
thickness. It is noted that in some write pole configurations,
other write pole layers like a yoke or bevel layer can be deposited
prior to the formation of a write pole core. Hence, step 362 is
merely an example first step for routine 360 and by no means limits
possible precursory layer manufacturing.
[0041] The formation of the write pole core, or a different write
pole layer, in step 362 can then be shaped in step 364 with at
least one bevel surface that faces the ABS. The creation of a write
pole core in step 362 can correspond with the shaping of a tip
surface with a predetermined length and at least one bevel surface
that extends from the ABS and tip surface with a predetermined,
non-orthogonal angle with respect to the ABS for a selected length.
The shaping of a bevel surface in step 364 is not limited to a
particular fabrication means, but in assorted embodiments
encompasses the masking of portions of the write pole core and the
subsequent removal of material to define a continuously linear
bevel surface facing away from the tip surface at a predetermined
angle.
[0042] With at least one bevel surface shaped in step 364, decision
366 next evaluates if another ABS contacting bevel surface is to be
formed. If another bevel surface is chosen, decision 366 advances
to step 368 where material is removed to provide a continuous bevel
angle. It is contemplated that step 364 would define a first write
pole core bevel surface, such as a leading side bevel, and step 368
would define a second write pole core surface, like a trailing side
bevel that establishes a trailing edge of the write pole core.
However, step 368 may alternatively form a bevel surface at a
predetermined angle for a bevel layer contacting the write pole
core and resident on the ABS, without limitation.
[0043] Whether step 368 shapes an additional bevel surface or if no
additional bevel was chosen from decision 366, decision 370
subsequently evaluates and determines if a bevel layer is to be
formed. Step 372 proceeds to deposit a bevel layer of a
predetermined material, such as Ni.sub.xFe.sub.1-x,
Fe.sub.xCo.sub.1-x, CoNiFe, laminated FeCo, and their alloy, with a
selected thickness and a length from the ABS that may, or may not,
extend a distance past the write pole core length. Next, step 374
shapes the bevel layer deposited in step 372 with a linear,
curvilinear, or combination bevel surface by removing portions of
the deposited material, which may be in the same or different
manner utilized in step 368 before returning to decision 370. The
return of step 374 to decision 370 allows multiple bevel layers
with differing materials, thicknesses, and lengths from the
ABS.
[0044] A determination that no additional bevel layers are to be
formed in decision 370 triggers step 376 where a yoke is deposited
on a selected side of the write pole core with a predetermined
thickness, material, and displacement from the ABS. The formation
of the yoke in step 376 can yield a completed write pole that is
ready to be incorporated into a transducing head. However, it
should be noted that the various steps and decisions of routine 360
are not required or limiting as any aspect can be modified,
removed, and added. For example, the deposition of a yoke may be
followed by one or more steps that form soft magnetic shields about
the write pole. In another non-limiting example, the write pole may
be mated with a data reader, such as a magnetoresistive lamination
positioned on the ABS and separated from the write pole by a
magnetic shield.
[0045] Through the tuned configuration of a write pole core to have
bevel surfaces angled at different, non-orthogonal angles, the
writeability and efficiency of data bit programming can be
increased. The incorporation of one or more bevel layers positioned
on leading and trailing sides of the write pole core and providing
different bevel surfaces displaced from the ABS can further control
magnetic flux to optimize magnetic field gradient and supply
sufficient magnetic flux at precise portions of the write pole
core. As such, the ability to tune a write pole with various write
pole core, bevel layer, and yoke structural configurations can
focus magnetic flux towards the ABS to allow fast data bit
programming recovery despite having reduced dimensions, such as
sub-100 nm write pole core thickness.
[0046] It is to be understood that even though numerous
characteristics and various embodiments have been set forth in the
foregoing description, together with details of the structure and
function, this detailed description is illustrative only, and
changes may be made in detail, especially in matters of structure
and arrangements of parts within the principles of the present
disclosure to the full extent indicated by the broad general
meaning of the terms in which the appended claims are expressed.
For example, the particular elements may vary depending on the
particular application without departing from the spirit and scope
of the technology.
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