US 9,361,912 B1Granted

High moment side shield design for area density improvement of perpendicular magnetic recording (PMR) writer

AssigneesHeadway Technologies, Inc., TDK Corporation

InventorsYue Liu, Atsushi Yamaguchi, Yuhui Tang, Jiun-Ting Lee, Yaguang Wei, Xiaomin Liu, Hideyuki Ukita, Moris Dovek, Michitaka Nishiyama

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Abstract

A PMR writer is disclosed wherein a hot seed layer (HS) made of a 19-24 kilogauss (kG) magnetic material is formed between a side gap and a 10-16 kG magnetic layer in the side shields, and between a 16-19 kG magnetic layer and the leading gap in the leading shield to improve Hy_grad and Hy_grad_x while maintaining write-ability. The HS is from 10 to 100 nm thick and has a first side facing the write pole with a height of ≦0.15 micron, and a second side facing a main pole flared side that may extend to a full side shield height of ≦0.5 micron. First and second sides may form a continuous curve or the a double tapered design where first and second sides have different angles with respect to a center plane. The side shield design described herein is especially beneficial for side gaps of 20-60 nm.

Claims10

Dependent claims

A perpendicular magnetic recording (PMR) writer, comprising:

(a) a main pole with a leading side and a trailing side, the leading side adjoins a lead gap at an air bearing surface (ABS) and the trailing side adjoins a write gap at the ABS;
(b) a side gap which contacts a side of the main pole formed between the trailing side and leading side on each side of a center plane that bisects the main pole in a direction orthogonal to the ABS;
(c) a lead gap that is connected to an end of each side gap and contacts the leading side of the main pole;
and
(d) a side shield and leading shield structure comprising:
(1) a hot seed layer made of a 19-24 kilogauss (kG) magnetic material having a side that faces the main pole wherein a first portion thereof adjoins the lead gap and a second portion contacts the side gap on each side of the center plane;
and
(2) a first magnetic layer made of a 10-16 kG magnetic material that adjoins the first portion on a side thereof which faces away from the main pole and together with the hot seed layer first portion forms a composite leading shield;
and
(3) a second magnetic layer made of a 10-16 kG magnetic material that adjoins each second portion on a side thereof that faces away from the main pole and with the hot seed layer second portion forms a composite side shield.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/690,693Filed 20 Apr 2015
Granted: 7 Jun 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

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 5/00826
Using stationary heads: comprising a plurality of single poles or gaps or groups thereof operative at the same time
G11B 5/1278
Structure or manufacture of heads, e.g. inductive: specially adapted for magnetisations perpendicular to the surface of the record carrier
G11B 5/187
Structure or manufacture of heads, e.g. inductive: structure or manufacture of the surface of the head in physical contact with, or immediately…