US 10,832,707 B1Granted

Shape designs of magnetic flux guiding devices all around the main pole in assisted writing applications

AssigneeHeadway Technologies, Inc.

InventorsWenyu Chen, Ying Liu, Yan Wu, Yuhui Tang

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Abstract

A perpendicular magnetic recording writer has a main pole (MP) with a first flux guiding (FG) device in a write gap between the MP trailing side and a trailing shield, and a second FG device in the leading gap (LG) and each side gap (SG). The SG angle is reduced to 15° to 45° to enable conformal and more uniform FG device layers to be formed in the SG and LG. As a result, the MP shape and write field are more reproducible. To compensate for a thinner MP thickness at the air bearing surface that results from maintaining the track width at a shallower SG angle, an upper MP tip may be formed on the lower MP tip thereby generating a hexagonal shape for the combined MP tip. In this case, the second FG device conforms to the shape of the two upper MP tip sides and trailing side.

Claims25

Dependent claims

A perpendicular magnetic recording (PMR) writer, comprising:

(a) a main pole (MP) having a pole tip with a hexagonal shape;
comprising:
(1) a lower pole tip with a top surface formed between two lower pole tip corners and at a first plane that is orthogonal to an air bearing surface (ABS), a leading side and two lower pole tip sides connecting the lower pole tip corners with the leading side, wherein the leading side adjoins a lead gap (LG), and the two lower pole tip sides each contact a side gap (SG);
and
(2) an upper pole tip formed on the lower pole tip top surface, and with a trailing side and two upper pole tip sides connecting the lower pole tip corners with the trailing side, and wherein the two upper pole tip sides adjoin a write gap (WG);
(b) a side shield (SS) with an inner side contacting each SG, and with a bottom surface formed at a second plane that is parallel to the first plane and comprises a top surface of a leading shield (LS), and wherein each SS inner side forms a side gap angle δ with respect to the SS bottom surface;
(c) a first flux guiding (FG) device that is formed on the upper pole tip sides and trailing side and in the WG, and a second FG device formed on the LS top surface in the LG and on the inner SS side in each SG, and wherein the first and second FG devices comprise a first flux guiding layer (FGL1) and second flux guiding layer (FGL2), respectively, and are configured so that a FGL1 magnetization flips to a direction substantially opposing a flux field in the WG, and a FGL2 magnetization in the LG and in each SG flips to a direction substantially opposing a flux field in the LG and in each SG, respectively, when a current (Ib) of sufficient current density is applied across the first and second FG devices so that reluctance is increased in each of the WG, SG, and LG thereby enhancing a write field from the MP tip on a magnetic medium;
and
(d) a trailing shield structure comprising a first trailing shield (TS) on the first FG device and on portions of the WG adjoining the first FG device.

6 more elements

A method of forming a perpendicular magnetic recording (PMR) writer, comprising:

(a) providing a substrate comprised of a leading shield (LS) and a side shield (SS) on the LS, and wherein the SS has an opening therein bounded by two SS inner sides and a LS top surface;
(b) depositing a first stack of magnetic flux guiding (FG) device layers on the two inner SS sides and on the LS top surface that partially fills the opening, and wherein the first stack of FG device layers comprises a first flux guiding layer (FGL1);
(c) depositing a lower main pole (MP) tip on the first stack of FG device layers to fill the opening, wherein a top surface of the lower MP tip is formed between two MP tip corners, and the first stack of FG device layers has a leading side and two sides each connecting the leading side to one of the MP corners;
(d) patterning the first stack of FG device layers to form two sides thereon that each extend from a top end at one of the MP tip corners to a bottom end at a SS top surface;
(e) forming an upper MP tip on the lower MP tip top surface, and wherein the upper MP tip has two sides that each extend from one of the MP corners at a bottom end to an upper MP tip trailing side at a top end;
(f) forming a second stack of FG device layers on the two sides and trailing side of the upper MP tip, and wherein the second stack of FG device layers comprises a second FGL (FGL2);
and
(g) forming a first trailing shield (TS) on the second stack of FG device layers so that when a current (Ib) of sufficient current density is applied between the upper MP tip and first TS, a FGL2 magnetization flips to a direction substantially opposing a write gap flux field, and when Ib is applied between the lower MP tip and the LS and SS, a FGL1 magnetization flips to a direction substantially opposing a leading gap flux field and side gap flux field, respectively.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/916,497Filed 30 Jun 2020 · division
Priority: 25 Jun 2019
Granted: 10 Nov 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G11B 5/1278
Structure or manufacture of heads, e.g. inductive: specially adapted for magnetisations perpendicular to the surface of the record carrier
G11B 5/1335
With cores composed of particles, e.g. with dust cores, with ferrite cores with cores composed of isolated magnetic particles: assembling or…
G11B 5/3116
Details: shaping of layers, poles or gaps for improving the form of the electrical signal transduced, e.g. for shielding, contour effect,…
G11B 5/312
Details: for reducing flux leakage between the electrical coil layers and the magnetic cores or poles or between the magnetic cores or poles