Co-based alloy media with a high coercivity prepared by heat treatment after sputtering

Author

Sato, Motoharu ; Shi, Yoshihiko Oni ; Nakaue, Akimitsu

Author_Institution

Kobe Steel, Ltd., Japan

Volume

29

Issue

6

fYear

1993

fDate

11/1/1993 12:00:00 AM

Firstpage

3685

Lastpage

3687

Abstract

The effects of heat treatment on magnetic properties of Co-based alloy thin-film media using newly developed carbon substrates is discussed. High coercivity (Hc) can be obtained by heat treatment after sputtering using a Zr thin-film as a protective layer. In the case of Zr/Co_62.5Ni₃₀Cr/Cr thin-film media, Hc of 3500 Oe was obtained after heat treatment at 650°C for one minute. No significant change was found in the grain size after heat treatment. From the results of a compositional analysis using X-ray energy dispersive spectroscopy (EDS) in high resolution scanning transmission electron microscopy (HRSTEM), it was found that Cr was segregated from the Cr underlayer to the grain boundary of the Co-based alloy with increasing heat treatment temperature

Keywords

X-ray chemical analysis; X-ray diffraction examination of materials; X-ray photoelectron spectra; cobalt alloys; coercive force; ferromagnetic properties of substances; grain boundary segregation; grain size; heat treatment; magnetic multilayers; magnetic recording; magnetic thin films; magnetisation; nickel alloys; scanning-transmission electron microscope examination of materials; sputter deposition; zirconium alloys; 1 min; 650 C; C substrate; EDS; HRSTEM; X-ray diffraction; X-ray energy dispersive spectroscopy; X-ray photoelectron spectroscopy; Zr-Co_62.5Ni₃₀Cr_7.5-Cr; coercivity; compositional analysis; grain boundary; grain size; heat treatment; high resolution scanning transmission electron microscopy; magnetic properties; magnetic recording; magnetisation; protective layer; segregation; thin-film media; Chromium; Coercive force; Grain size; Heat treatment; Magnetic films; Magnetic properties; Protection; Sputtering; Substrates; Zirconium;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.281269

Filename

281269