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31. 发明专利

JP2013254554A MAGNETIC RECORDING HEAD AND MAGNETIC RECORDING DEVICE PROVIDED WITH THE SAME 审中-公开
公开(公告)号：JP2013254554A
公开(公告)日：2013-12-19
申请号：JP2013149669
申请日：2013-07-18
申请人： TOSHIBA CORP
发明人： KOI KATSUHIKO , SHIMIZU MARIKO , MURAKAMI SHUICHI , YAMADA KENICHIRO
IPC分类号： G11B5/31 , G11B5/02 , H01F10/14 , H01F10/16 , H01F10/32 , H01L29/82 , H01L43/08
摘要： PROBLEM TO BE SOLVED: To provide a magnetic recording head that can generate a large high-frequency magnetic field while maintaining a high frequency, and further to provide a magnetic recording device provided therewith.SOLUTION: A magnetic recording head of a magnetic recording device comprises: a main magnetic pole 66 for applying a recording magnetic field; a trailing shield 68 opposite to the main magnetic pole 66 with a write gap WG interposed therebetween; and a spin torque oscillator 74 that is provided between the main magnetic pole 66 and the trailing shield 68 and generates a high-frequency magnetic field by causing a current to flow therethrough. The spin torque oscillator 74 has a spin injection layer 74b, an intermediate layer 74c and an oscillation layer 74d. The oscillation layer 74d is formed by repeatedly laminating laminates of body-centered cubic crystal metal magnetic layers and metal magnetic layers containing Co twice or more. A film thickness of each body-centered cubic crystal metal magnetic layer and a film thickness of each metal magnetic layer containing Co are individually greater than 0.2nm and not greater than 3nm. An anisotropic magnetic field in a direction perpendicular to a film surface of the oscillation layer 74d is greater than a value obtained by subtracting a gap magnetic field from a demagnetizing field perpendicular to the film surface of the oscillation layer 74d and is less than the demagnetizing field.

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