Invention Grant
- Patent Title: Magnetic recording medium, magnetic signal reproduction system and magnetic signal reproduction method
- Patent Title (中): 磁记录介质,磁信号再现系统和磁信号再现方法
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Application No.: US12295541Application Date: 2007-03-30
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Publication No.: US08236434B2Publication Date: 2012-08-07
- Inventor: Takeshi Harasawa , Masahito Oyanagi
- Applicant: Takeshi Harasawa , Masahito Oyanagi
- Applicant Address: JP Tokyo
- Assignee: FUJIFILM Corporation
- Current Assignee: FUJIFILM Corporation
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP2006-099936 20060331
- International Application: PCT/JP2007/057301 WO 20070330
- International Announcement: WO2007/114395 WO 20071011
- Main IPC: G11B5/706
- IPC: G11B5/706

Abstract:
The present invention relates to a magnetic recording medium comprising a magnetic layer comprising a hexagonal ferrite powder and a binder on one surface of a nonmagnetic support and a backcoat layer on the other surface of the nonmagnetic support. A power spectrum density at a pitch of 10 micrometers ranges from 800 to 10,000 nm3 on the magnetic layer surface, a power spectrum density at a pitch of 10 micrometers ranges from 20,000 to 80,000 nm3 on the backcoat layer surface, the magnetic layer has a center surface average surface roughness Ra, as measured by an atomic force microscope, ranging from 0.5 to 2.5 nm, and the hexagonal ferrite powder has an average plate diameter ranging from 10 to 40 nm.
Public/Granted literature
- US20090168265A1 MAGNETIC RECORDING MEDIUM, MAGNETIC SIGNAL REPRODUCTION SYSTEM AND MAGNETIC SIGNAL REPRODUCTION METHOD Public/Granted day:2009-07-02
Information query
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