Title :
Magnetic and recording characteristics of multilayer CoNiCr thin film media
Author :
Hata, H. ; Hyohno, T. ; Fukuichi, T. ; Yabushita, K. ; Umesaki, M. ; Shibata, H.
Author_Institution :
Mitsubishi Electr. Corp., Hyogo, Japan
fDate :
9/1/1990 12:00:00 AM
Abstract :
The magnetic properties and the recording characteristics of multilayer CoNiCr thin film media with Cr interlayers have been examined. A great improvement in the signal-to-noise ratio is obtained by increasing the number of split layers: this improvement is due to the reduced media noise, which is accompanied by a reduction in the coercive squareness. TEM (transmission electron microscopy) observation shows that the CoNiCr grains in the multilayer media are more isolated compared with the single-layer media. This result suggests that the Cr interlayers constrain the crystal growth of the CoNiCr. It is therefore expected that the reduction in the media noise is due to the combined effect of the reduction in the interlayer coupling among the CoNiCr layers by the Cr interlayers and the reduction in the intergrain exchange coupling caused by the isolation of the CoNiCr grains
Keywords :
chromium alloys; cobalt alloys; coercive force; ferromagnetic properties of substances; grain size; magnetic recording; magnetic thin films; metallic thin films; nickel alloys; noise; transmission electron microscope examination of materials; Cr-CoNiCr; TEM; coercive squareness; grains; intergrain exchange coupling; magnetic properties; multilayer CoNiCr thin film media; recording characteristics; reduced media noise; signal-to-noise ratio; split layers; Chromium; Magnetic films; Magnetic multilayers; Magnetic noise; Magnetic properties; Magnetic recording; Noise reduction; Nonhomogeneous media; Signal to noise ratio; Transmission electron microscopy;
Journal_Title :
Magnetics, IEEE Transactions on
