公开(公告)号：US20200099456A1

公开(公告)日：2020-03-26

申请号：US16139364

申请日：2018-09-24

Applicant: Seagate Technology LLC

Inventor： Andrzej Adam Stankiewicz ,  Scott Wilson Stokes ,  Krishnan Subramanian

IPC: H04B15/02 ,  H04B15/00 ,  H04B17/14 ,  H04B17/345

Abstract: An apparatus and method for mitigating noise in a waveform from a signal-producing device. The method includes receiving the waveform from the signal-producing device, and decomposing the waveform into low frequency (LF) and high frequency (HF) components. The method also includes determining an instant amplitude of the HF component, and employing the instant amplitude of the HF component and possibly the LF component to obtain a noise correction value for the LF component. The method further includes adding the obtained noise correction value to the LF component to obtain an output signal.

公开(公告)号：US11423929B1

公开(公告)日：2022-08-23

申请号：US17392627

申请日：2021-08-03

Applicant: Seagate Technology LLC

Inventor： Victor Sapozhnikov ,  Taras Grigorievich Pokhil ,  Andrzej Adam Stankiewicz ,  Mohammed Shariat Ullah Patwari

IPC: G11B5/39 ,  G11B5/31 ,  G01R33/09 ,  H01L43/02 ,  H01L43/08 ,  H01L43/12 ,  H01F10/32

Abstract: A reader includes a bearing surface and a free layer having a front surface that forms a portion of the bearing surface. The reader also includes a synthetic antiferromagnetic (SAF) structure below the free layer, the SAF structure has a narrow portion with a front surface that forms a portion of the bearing surface and a wide portion behind the narrow portion. The reader further includes an antiferromagnetic (AFM) layer in contact with the wide portion of the SAF structure. The SAF structure is configured to prevent switching from one magnetic state to another magnetic state in the wide portion under thermal fluctuations.