Invention Grant
- Patent Title: Magnetic recording medium having characterized magnetic layer
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Application No.: US16037564Application Date: 2018-07-17
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Publication No.: US10714139B2Publication Date: 2020-07-14
- Inventor: Takuto Kurokawa , Norihito Kasada , Toshio Tada , Eiki Ozawa
- Applicant: FUJIFILM Corporation
- Applicant Address: JP Tokyo
- Assignee: FUJIFILM Corporation
- Current Assignee: FUJIFILM Corporation
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: com.zzzhc.datahub.patent.etl.us.BibliographicData$PriorityClaim@621131b1
- Main IPC: G11B5/70
- IPC: G11B5/70 ; G11B5/706 ; G11B5/708

Abstract:
The magnetic recording medium includes a non-magnetic support and a magnetic layer containing ferromagnetic powder and a binder, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer contains an abrasive, an intensity ratio of a peak intensity of a diffraction peak of (110) plane of a crystal structure of the hexagonal ferrite, determined by performing X-ray diffraction analysis on the magnetic layer by using an In-Plane method, to a peak intensity of a diffraction peak of (114) plane of the crystal structure is equal to or higher than 0.5 and equal to or lower than 4.0, a squareness ratio of the magnetic recording medium in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00, and a contact angle with 1-bromonaphthalene measured within a surface of the magnetic layer is in a range of 50.0° to 55.0°.
Public/Granted literature
- US20190027176A1 MAGNETIC RECORDING MEDIUM Public/Granted day:2019-01-24
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