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1. (WO2011148845) GLASS SUBSTRATE AND METHOD FOR PRODUCING THE SAME

Pub. No.:    WO/2011/148845    International Application No.:    PCT/JP2011/061487
Publication Date: Dec 1, 2011 International Filing Date: May 19, 2011
IPC: G11B 5/73
G11B 5/84
Applicants: KONICA MINOLTA OPTO, INC.
コニカミノルタオプト株式会社
ENDO, Takeshi
遠藤 毅
Inventors: ENDO, Takeshi
遠藤 毅
Title: GLASS SUBSTRATE AND METHOD FOR PRODUCING THE SAME
Abstract:
Provided is a glass substrate which is used as a substrate for a thermally assisted magnetic recording medium, wherein a magnetic recording layer is a film which is formed on the glass substrate and then subjected to a post-heat treatment, and the recording layer satisfies Ts / Tg > 0.8 (formula 1) and ΔRMS < 0.1 Mpa (formula 2) when Ts is the maximum temperature reached by the glass substrate during the post-heat treatment, Tg is the glass transition temperature of the glass substrate, and ΔRMS is the amount of change in the deviation of the stress distribution over the entire surface of the glass substrate before the post-heat treatment and after the post-heat treatment of the magnetic recording layer.