Invention Grant
US08116031B2 Perpendicular magnetic recording system with helical write coil and auxiliary coil for fast switching of write pole magnetization
有权
具有螺旋写入线圈和辅助线圈的垂直磁记录系统,用于快速切换写磁极磁化
- Patent Title: Perpendicular magnetic recording system with helical write coil and auxiliary coil for fast switching of write pole magnetization
- Patent Title (中): 具有螺旋写入线圈和辅助线圈的垂直磁记录系统,用于快速切换写磁极磁化
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Application No.: US12419278Application Date: 2009-04-06
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Publication No.: US08116031B2Publication Date: 2012-02-14
- Inventor: Michael Alex , John Thomas Contreras , Manfred Ernst Schabes , Xinzhi Xing
- Applicant: Michael Alex , John Thomas Contreras , Manfred Ernst Schabes , Xinzhi Xing
- Applicant Address: NL Amsterdam
- Assignee: Hitachi Global Storage Technologies Netherlands B.V.
- Current Assignee: Hitachi Global Storage Technologies Netherlands B.V.
- Current Assignee Address: NL Amsterdam
- Agent Thomas R. Berthold
- Main IPC: G11B5/17
- IPC: G11B5/17

Abstract:
A perpendicular magnetic recording system has a write head having a main helical coil (the write coil) and main pole (the write pole) that directs write flux in a direction perpendicular to the recording layer in the magnetic recording medium, and an auxiliary coil and auxiliary pole that injects magnetic flux into the write pole at an angle to the primary or perpendicular axis of the write pole. The auxiliary coil is preferably a helical coil wrapped around the auxiliary pole. The additional flux from the auxiliary pole, which is injected non-parallel to the primary magnetization of the write pole, exerts a relatively large torque on the magnetization of the write pole, thereby facilitating magnetization reversal of the write pole. Electrical circuitry is connected to the main coil and the auxiliary coil to generate the auxiliary flux simultaneous with the switching of the magnetization of the write pole.
Public/Granted literature
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