公开(公告)号：US09928873B1

公开(公告)日：2018-03-27

申请号：US15638839

申请日：2017-06-30

Applicant: Seagate Technology LLC

Inventor： Dongming Liu ,  Huazhou Lou ,  Eric John McCalla ,  James Robert Oscarson ,  Shawn S. Silewski

IPC: G11B21/02 ,  G11B21/21 ,  G11B23/50 ,  G11B5/40 ,  G11B5/60 ,  G11B7/122 ,  G11B5/00 ,  G11B5/31

CPC classification number: G11B21/21 ,  G11B5/3106 ,  G11B5/40 ,  G11B5/6064 ,  G11B5/607 ,  G11B5/6076 ,  G11B5/6082 ,  G11B7/122 ,  G11B23/507 ,  G11B2005/0016

Abstract: An apparatus comprises a slider configured for writing data to and reading data from a magnetic recording medium and for heat-assisted magnetic recording. The slider comprises a heater configured to receive an AC signal and to cause oscillation in a spacing between the slider and the medium, and a contact sensor situated on the slider and configured to produce a DC response signal. A detector is coupled to the slider and configured to measure an amplitude of a spike in the DC response signal, calculate a ratio between the spike amplitude and an amplitude of the DC response signal, and detect contact between the slider and the medium in response to the ratio exceeding a predetermined threshold.