Invention Grant
- Patent Title: Magnetic tape and method of manufacturing the same
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Application No.: US15388911Application Date: 2016-12-22
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Publication No.: US10573341B2Publication Date: 2020-02-25
- Inventor: Toshio Tada , Norihito Kasada , Masahito Oyanagi
- Applicant: FUJIFILM Corporation
- Applicant Address: JP Tokyo
- Assignee: FUJIFILM Corporation
- Current Assignee: FUJIFILM Corporation
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP2015-254186 20151225
- Main IPC: G11B5/714
- IPC: G11B5/714 ; G11B5/845 ; G11B5/708 ; G11B5/712 ; G11B5/78

Abstract:
The magnetic tape has a nonmagnetic layer containing nonmagnetic powder and binder on a nonmagnetic support and a magnetic layer containing ferromagnetic powder and binder on the nonmagnetic layer, wherein a fatty acid ester is contained in at least the magnetic layer, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the ferromagnetic hexagonal ferrite powder has a crystallite volume as determined by X-ray diffraction analysis ranges from 1,000 nm3 to 2,400 nm3, and a ratio of the crystallite size Dx(107) obtained from a diffraction peak of a (107) plane to a particle size in a direction of an easy axis of magnetization DTEM as determined by observation with a transmission electron microscope, Dx(107)/DTEM, is greater than or equal to 1.1, and ΔSFD in a longitudinal direction of the magnetic tape as calculated with Equation 1: ΔSFD=SFD25° C.−SFD−190° C., ranges from 0.50 to 1.60.
Public/Granted literature
- US20170186456A1 MAGNETIC TAPE AND METHOD OF MANUFACTURING THE SAME Public/Granted day:2017-06-29
Information query
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