公开(公告)号：US10699734B2

公开(公告)日：2020-06-30

申请号：US16277947

申请日：2019-02-15

Applicant: Western Digital Technologies, Inc.

Inventor： Zhigang Bai ,  Alexander Taratorin ,  Anna Zheng ,  Venkatesh Chembrolu ,  Supradeep Narayana ,  Suping Song ,  Yaguang Wei ,  Terence Lam ,  Michael Kuok San Ho ,  Changqing Shi ,  Lijie Guan

IPC: G11B5/31 ,  G11B5/23 ,  G11B5/235 ,  G11B5/147 ,  G11B5/127 ,  G11B5/00

Abstract: A magnetic recording write head has an electrically-conductive structure in the write gap between the write pole and the trailing shield and electrical circuitry for directing current through the write gap. The current through the electrically-conductive structure generates a circular Ampere field which, at the disk-facing end of the write pole, is substantially parallel to the disk-facing end of the write pole. The electrically-conductive structure in the write gap may be a STO or an electrically-conductive layer that is not part of a STO. The current direction through the electrically-conductive structure in the write gap is selected so that the generated Ampere field at the write pole end is in substantially the same direction as the magnetization direction of the write head side shields, which has been discovered to result in minimization of cross-track interference.

公开(公告)号：US10957348B2

公开(公告)日：2021-03-23

申请号：US16911143

申请日：2020-06-24

Applicant: Western Digital Technologies, Inc.

Inventor： Zhigang Bai ,  Alexander Taratorin ,  Anna Zheng ,  Venkatesh Chembrolu ,  Supradeep Narayana ,  Suping Song ,  Yaguang Wei ,  Terence Lam ,  Michael Kuok San Ho ,  Changqing Shi ,  Lijie Guan

IPC: G11B5/11 ,  G11B5/31 ,  G11B5/235 ,  G11B5/147 ,  G11B5/23 ,  G11B5/127 ,  G11B5/00

Abstract: A magnetic recording write head has an electrically-conductive structure in the write gap between the write pole and the trailing shield and electrical circuitry for directing current through the write gap. The current through the electrically-conductive structure generates a circular Ampere field which, at the disk-facing end of the write pole, is substantially parallel to the disk-facing end of the write pole. The electrically-conductive structure in the write gap may be a STO or an electrically-conductive layer that is not part of a STO. The current direction through the electrically-conductive structure in the write gap is selected so that the generated Ampere field at the write pole end is in substantially the same direction as the magnetization direction of the write head side shields, which has been discovered to result in minimization of cross-track interference.

公开(公告)号：US10008229B2

公开(公告)日：2018-06-26

申请号：US14988651

申请日：2016-01-05

Applicant: Western Digital Technologies, Inc.

Inventor： Richard Leo Galbraith ,  Weldon Mark Hanson ,  Mark A. Nichols ,  Alexander Taratorin ,  Roger William Wood

IPC: G11B5/596

CPC classification number: G11B5/59683 ,  G11B5/59627

Abstract: A method, apparatus, and system are provided for implementing track following using signal asymmetry metrics monitored during read back in hard disk drives (HDDs). Signal asymmetry metrics monitored during read back are used together with a position error signal (PES) to correct and guide the position of a read sensor with respect to a written track in the HDD.