Magnetic recording medium using ϵ-iron oxide particle magnetic powder

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United States of America Patent

PATENT NO 10255938
APP PUB NO 20170221513A1
SERIAL NO

15420425

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Abstract

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A magnetic recording medium of the present invention includes a non-magnetic substrate, and a magnetic layer containing a magnetic powder. The magnetic powder is constituted by an ε-iron oxide powder. The magnetic layer has a squareness in a thickness direction of 0.65 or more. In a differential curve obtained by differentiating a hysteresis curve in the thickness direction of the magnetic layer, two or more peaks are present. In a case where, out of peaks in the same direction among the above-described peaks, a local maximum of a largest peak in a magnetic field range of +500 oersted [Oe] or more is taken as P1 and a local maximum of a largest peak in a magnetic field range of −500 oersted [Oe] or more and less than +500 oersted [Oe] is taken as P2, a relationship below is satisfied:

description='In-line Formulae' end='lead'0.25≤P2/P1≤0.60.description='In-line Formulae' end='tail'

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Patent Owner(s)

  • MAXELL HOLDINGS, LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hiroi, Toshio Osaka, JP 12 248
Kawakami, Shinji Osaka, JP 51 638
Tanaka, Kenji Osaka, JP 451 5913

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