发明申请
- 专利标题: PERPENDICULAR MAGNETIC RECORDING MEDIUM AND SYSTEM WITH LOW-CURIE-TEMPERATURE MULTILAYER FOR HEAT-ASSISTED WRITING AND/OR READING
- 专利标题(中): 具有低温度温度的多层磁性记录介质和系统,用于热辅助写入和/或读取
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申请号: US12041930申请日: 2008-03-04
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公开(公告)号: US20090226762A1公开(公告)日: 2009-09-10
- 发明人: Olav Hellwig , Bruce David Terris , Jan-Ulrich Thiele
- 申请人: Olav Hellwig , Bruce David Terris , Jan-Ulrich Thiele
- 申请人地址: US CA San Jose
- 专利权人: HITACHI GLOBAL STORAGE TECHNOLOGIES NETHERLANDS B.V.
- 当前专利权人: HITACHI GLOBAL STORAGE TECHNOLOGIES NETHERLANDS B.V.
- 当前专利权人地址: US CA San Jose
- 主分类号: G11B5/65
- IPC分类号: G11B5/65
摘要:
A perpendicular magnetic recording medium, usable for either continuous or patterned media, has a recording layer structure (RLS) of first and second perpendicular magnetic layers (PM1, PM2) and an antiferromagnetically coupling (AFC) layer and a ferromagnetic switching layer (SWL) between PM1 and PM2. The magnetic recording system uses heat to assist in the reading and/or writing of data. The SWL is a Co/Ni multilayer with a Curie temperature (TC-SWL) less than the Curie temperatures of PM1 and PM2. At room temperature, there is ferromagnetic coupling between SWL and the upper ferromagnetic layer (PM2) so that the magnetizations of SWL and PM2 are parallel, and antiferromagnetic coupling between SWL and the lower ferromagnetic layer (PM1) across the AFC layer so that the magnetization of PM1 is aligned antiparallel to the magnetizations of SWL and PM2. When the SWL is heated to above TC-SWL it is no longer ferromagnetic, there is no antiferromagnetic coupling between the SWL and PM1 across the AFC layer, and the magnetizations of PM1 and PM2 become aligned parallel.