US 10,916,261 B1Granted

True one turn (T1T) perpendicular magnetic recording (PMR) writer designs

AssigneeHeadway Technologies, Inc.

InventorYue Liu

Life of this patent

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Abstract

A PMR writer with a true one turn design is disclosed with a driving coil above the main pole (MP) but where a bucking coil below the MP is replaced by a dummy metal layer or fully removed to substantially enhance the return field to the trailing shield. A non-double write shield scheme is employed where the leading loop for magnetic flux return is terminated at the leading shield. A tapered bottom yoke (tBY) contacts the MP bottom surface and has a tapered front side at height tBYd from the air bearing surface. Bottom yoke (BY) is below the tBY and has a front side at height BYd where BYd>tBYd. Reader-writer separation is reduced by 1-2 microns when the bucking coil is fully removed. Wide adjacent track erasures are controlled with a high damping material in one or more of the leading, side and trailing shields.

Claims16

Dependent claims

A perpendicular magnetic recording (PMR) writer configured in a true one turn (T1T design);

comprising:
(a) a main pole layer (MP) that has a MP tip at an air bearing surface (ABS), a top surface contacting a bottom surface of a top yoke (TY), and a bottom surface adjoining a top surface of a tapered bottom yoke (tBY);
(b) the TY with a front side that is recessed from the ABS, and a top surface;
(c) a one turn driving coil formed between the MP and a trailing shield structure and entirely above a plane that comprises the TY top surface, wherein the one turn driving coil is the only active coil that is electrically connected to a pad;
(d) the trailing shield structure comprised of a hot seed (HS) layer and overlying write shield (WS) at the ABS, and an uppermost (PP3) trailing shield (TS) with a middle portion formed over the one turn driving coil, and wherein the PP3 TS has a front portion that contacts a top surface of the WS, and a back portion that adjoins the TY top surface;
(e) the tBY wherein a top end of a front side thereof is at a first height (tBYd) from the ABS, and a backside is at a second height (h) from the ABS;
and
(f) a bottom yoke (BY) that adjoins a bottom surface of the tBY, and has a front side at a third height (BYd) from the ABS where BYd>tBYd.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/672,970Filed 4 Nov 2019
Granted: 9 Feb 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 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 5/17
Structure or manufacture of heads, e.g. inductive: construction or disposition of windings
G11B 5/3123
For reducing flux leakage between the electrical coil layers and the magnetic cores or poles or between the magnetic cores or poles: by using…
G11B 5/315
Magnetic layers: shield layers on both sides of the main pole, e.g. in perpendicular magnetic heads