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公开(公告)号:JP4919233B2
公开(公告)日:2012-04-18
申请号:JP2008159822
申请日:2008-06-19
Applicant: 国立大学法人東北大学
Abstract: PROBLEM TO BE SOLVED: To provide a magnetic recording method by which magnetic recording being able to perform high density recording is achieved by solving a problem of switching of polarity of circular polarization, a problem of magnitude of amplitude of alternative magnetic field, and a problem of variance of a resonance frequency of a recording medium which are problems when microwave-assist-recording is performed. SOLUTION: Switching of polarity when circular polarization is used is not required by making an alternating magnetic field used for microwave-assist-magnetic-recording have linear polarization. Further, a magnetization reversal magnetic field can be reduced remarkably by performing frequency modulation of an alternating magnetic field with a modulation amplitude ratio within a range of 0.5 to 50% of a basic frequency of alternating magnetic field and a modulation period ratio of 2 to 20 or less for a basic period of alternating magnetic field; consequently, amplitude of required alternating magnetic field can be reduced remarkably. Also, microwave-assist-recording can be performed stably even in a state in which variance of resonance frequencies of the recording media exists. COPYRIGHT: (C)2010,JPO&INPIT
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公开(公告)号:JP5067739B2
公开(公告)日:2012-11-07
申请号:JP2008193156
申请日:2008-07-28
Applicant: 国立大学法人東北大学 , 富士電機株式会社
CPC classification number: G11B5/656 , B82Y25/00 , G11B5/65 , G11B5/82 , H01F10/16 , H01F10/3254 , H01F10/3286 , H01F41/18 , H01L43/08 , H01L43/10 , H01L43/12 , Y10T428/115 , Y10T428/32
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公开(公告)号:JP4623594B2
公开(公告)日:2011-02-02
申请号:JP2006240161
申请日:2006-09-05
Applicant: 国立大学法人東北大学 , 富士電機ホールディングス株式会社
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公开(公告)号:JP5550007B2
公开(公告)日:2014-07-16
申请号:JP2008310965
申请日:2008-12-05
Applicant: 国立大学法人東北大学 , 富士電機株式会社
CPC classification number: G11B5/656 , G11B5/851 , H01F10/16 , H01F41/18 , H01L43/10 , Y10T428/1114 , Y10T428/115 , Y10T428/32
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