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1. (WO2018182046) NON-MAGNETIC SUBSTRATE FOR MAGNETIC DISK, AND MAGNETIC DISK

Pub. No.:    WO/2018/182046    International Application No.:    PCT/JP2018/014169
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Tue Apr 03 01:59:59 CEST 2018
IPC: G11B 5/73
G11B 5/82
Applicants: HOYA CORPORATION
HOYA株式会社
Inventors: OSAKABE, Kinobu
越阪部 基延
Title: NON-MAGNETIC SUBSTRATE FOR MAGNETIC DISK, AND MAGNETIC DISK
Abstract:
This non-magnetic substrate for a magnetic disk is provided with: a substrate body having two facing main surfaces; and a metal film provided on the main surfaces and made of a material which has a loss coefficient of 0.01 or greater. The thickness of the non-magnetic substrate, which is the sum of the thickness T of the substrate body and the thickness D of the metal film, is 0.700 mm or less, and the ratio D/T of the thickness D of the metal film to the thickness T of the substrate body is 0.025 or greater.