Invention Grant
- Patent Title: Method for manufacturing magnetic recording medium, magnetic recording medium and magnetic recording and reproducing apparatus
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Application No.: US14446450Application Date: 2014-07-30
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Publication No.: US09959895B2Publication Date: 2018-05-01
- Inventor: Ken Inoue , Kenji Shimizu , Gohei Kurokawa , Haruhisa Ohashi
- Applicant: SHOWA DENKO K.K.
- Applicant Address: JP Tokyo
- Assignee: SHOWA DENKO K.K.
- Current Assignee: SHOWA DENKO K.K.
- Current Assignee Address: JP Tokyo
- Agency: IPUSA, PLLC
- Priority: JP2013-162332 20130805
- Main IPC: C23C14/34
- IPC: C23C14/34 ; G11B5/851 ; C23C14/08 ; G11B5/65 ; G11B5/66 ; G11B5/84

Abstract:
A method for manufacturing a magnetic recording medium is provided. An orientation control layer is deposited on a non-magnetic substrate to control an orientation of a layer located directly thereon, and a perpendicular magnetic layer whose easy axis of magnetization is mainly oriented perpendicular to the non-magnetic substrate is deposited thereon. In depositing the orientation control layer, a first granular structure layer containing Ru or a material mainly made of Ru and a first oxide having a melting point of 1000 degrees C. or lower are deposited by sputtering. In depositing the perpendicular magnetic layer, a second granular structure layer containing magnetic particles and a second oxide having a melting point of 1000 degrees C. or lower are deposited by sputtering, and the magnetic particles are grown so as to form a columnar crystal continuing in a thickness direction. The columnar crystal includes crystal grains constituting the orientation control layer.
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