公开(公告)号：US09928881B1

公开(公告)日：2018-03-27

申请号：US15711790

申请日：2017-09-21

Applicant: Seagate Technology LLC

Inventor： Zhe Shen ,  Zuxuan Lin ,  Lei Lu ,  Jianhua Xue

IPC: G11B5/09 ,  G11B20/10 ,  G11B27/36 ,  G11B5/455 ,  G11B5/012 ,  G11B5/00 ,  G11B5/55

CPC classification number: G11B27/36 ,  G11B5/012 ,  G11B5/455 ,  G11B5/4555 ,  G11B5/5552 ,  G11B20/10009 ,  G11B20/10481 ,  G11B20/10509 ,  G11B2005/0013

Abstract: A method of testing a dynamic write field of a recording head includes preparing a test magnetic medium and recording a write signal on the test magnetic medium with the write signal being set at a first write parameter and a second write parameter. An average of multiple read-back signals of the recorded write signal are captured to determine an average amplitude of the read-back signals. The recording of the write signal on the test magnetic medium and the capturing of the average of multiple read-back signals of the recorded write signal are repeated to determine the average amplitude of the read-back signals by fixing the first write parameter of the write signal and changing the second write parameter of the write signal until the average amplitude of the read-back signals saturates.

公开(公告)号：US20170092306A1

公开(公告)日：2017-03-30

申请号：US15338729

申请日：2016-10-31

Applicant: Seagate Technology LLC

Inventor： Xiaohong Zhang ,  Wei Tian ,  Zhe Shen ,  Dong Lin ,  Joseph Mundenar

IPC: G11B5/39

CPC classification number: G11B5/3912 ,  G11B5/11 ,  G11B5/1278 ,  G11B5/3116 ,  G11B5/3146 ,  G11B5/3163

Abstract: Implementations disclosed herein provide an apparatus comprising a write pole, and a two-layer front shield formed on the write pole, the front shield comprising, a first dielectric material formed on the first layer of the front shield, an active shield control (ASC) device formed between the two layers of the front shield on the first dielectric material configured to synchronize the response to a magnetomotive force (MMF) of a write pole and the front shield, and a second dielectric material formed on the ASC device, wherein the second layer of the front shield is formed only on top of the second dielectric material and the first layer of the front shield.

公开(公告)号：US09218825B2

公开(公告)日：2015-12-22

申请号：US14052337

申请日：2013-10-11

Applicant: Seagate Technology LLC

Inventor： Jianhua Xue ,  Zhe Shen ,  Christopher James Rea ,  Eric Roger Meloche ,  Huaqing Yin

IPC: G11B5/127 ,  G11B5/187 ,  G11B5/31 ,  G11B5/11 ,  G11B5/60

CPC classification number: G11B5/1278 ,  G11B5/11 ,  G11B5/1871 ,  G11B5/3116 ,  G11B5/315 ,  G11B5/3163 ,  G11B5/6082

Abstract: A magnetic element may be generally configured with at least a write pole that has leading and trailing regions on an air bearing surface. The leading region may have a trailing width connected to a leading width of the trailing region via a transition feature to form a substantially T-shaped cross-section on the air bearing surface.

Abstract translation: 磁性元件可以通常配置有至少一个在空气轴承表面上具有前部和后部区域的写入极。 引导区域可以具有经由过渡特征连接到尾部区域的前导宽度的拖尾宽度，以在空气轴承表面上形成基本上T形的横截面。