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Effect of Interlayers Upon Texture and Magnetic Properties in Co Alloy Multilayer Films for Longitudinal Magnetic Recording

Published online by Cambridge University Press:  15 February 2011

M. R. Visokay
Affiliation:
Kobe Steel USA, Applied Electronics Center, Palo Alto CA, 94304 Department of Materials Science and Engineering, Stanford University, Stanford CA 94305
M. Kuwabara
Affiliation:
Kobe Steel USA, Applied Electronics Center, Palo Alto CA, 94304
H. Saffari
Affiliation:
Kobe Steel USA, Applied Electronics Center, Palo Alto CA, 94304
H. Hayashi
Affiliation:
Kobe Steel USA, Applied Electronics Center, Palo Alto CA, 94304
R Sinclair
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford CA 94305
Y. Onishi
Affiliation:
Kobe Steel Limited, Technical Development Group, Kobe, Japan
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Abstract

CoCrNi bilayer films with Cr, Ti and Zr interlayers were deposited by DC magnetron sputtering onto ultra densified amorphous carbon substrates and characterized using cross-section transmission electron microscopy and vibrating sample magnetometry. The films are polycrystalline with a columnar microstructure. In the Cr interlayer case there is layer-to-layer epitaxy throughout a given column. Magnetic measurements snowed a simple in-plane easy axis magnetic hysteresis loop. In the Zr and Ti interlayer cases epitaxy within a column was lost beginning with the first CoCrNi/(Zr/Ti) interface, resulting in a magnetic layer consisting of two crystallographically unrelated CoCrNi films. Magnetic measurements revealed a complex step-structure hysteresis loop for this case. Annealing the Zr interlayer film led to a significant growth of the amorphous layer due to a solid state amorphization reaction between the Zr and CoCrNi, which was accompanied by a decrease in the saturation magnetization.

Type
Research Article
Copyright
Copyright © Materials Research Society 1994

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Effect of Interlayers Upon Texture and Magnetic Properties in Co Alloy Multilayer Films for Longitudinal Magnetic Recording
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