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1. (WO2018131507) MAGNETIC RECORDING MEDIUM

Pub. No.:    WO/2018/131507    International Application No.:    PCT/JP2017/047257
Publication Date: Fri Jul 20 01:59:59 CEST 2018 International Filing Date: Fri Dec 29 00:59:59 CET 2017
IPC: G11B 5/706
G11B 5/712
G11B 5/714
Applicants: SONY CORPORATION
ソニー株式会社
Inventors: TERAKAWA, Masaru
寺川 潤
KANEMAKI, Yoichi
印牧 洋一
YAMAGA, Minoru
山鹿 実
Title: MAGNETIC RECORDING MEDIUM
Abstract:
Provided is a magnetic recording medium for which the shortest recording wavelength is 75 nm or less and which is used in a recording and reproducing device. The magnetic recording medium includes a recording layer containing a powder of particles comprising ε iron oxide. The average particle size of the particles is 22 nm or less, the coercivity Hc is 220-320 kA/m, and the nonlinear transition point shift is 20% or less.