Title :
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
fDate :
11/1/1993 12:00:00 AM
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/Co62.5Ni30Cr/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-Co62.5Ni30Cr7.5-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;
Journal_Title :
Magnetics, IEEE Transactions on
