公开(公告)号：US20200005815A1

公开(公告)日：2020-01-02

申请号：US16277953

申请日：2019-02-15

Applicant: Western Digital Technologies, Inc.

Inventor： Zhigang BAI ,  Venkatesh CHEMBROLU ,  Yaguang WEI ,  Terence LAM ,  Michael Kuok San HO ,  Lijie GUAN ,  Suping SONG ,  Supradeep NARAYANA

IPC: G11B5/115 ,  G11B5/53

Abstract: A current-assisted magnetic recording write head has an electrically conductive layer in the write gap between the write pole and the trailing shield. Electrical circuitry directs current from the write pole, through the conductive layer, to the trailing shield. The current through the conductive layer generates an Ampere field substantially orthogonal to the magnetization in the write pole to assist magnetization switching of the write pole. The write head's magnetic throat height (THm) is substantially the thickness of the trailing shield at the write gap, while the write head's electrical throat height (THe) is substantially the height of the conductive layer in the write gap. In embodiments of this invention, the signal-to-noise ratio (SNR) of the readback signal and the soft error rate (SER) of the recorded data can be improved with a write gap structure wherein THe is greater than THm.

公开(公告)号：US20190267029A1

公开(公告)日：2019-08-29

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: G11B5/147 ,  G11B5/31 ,  G11B5/23

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.