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Magnetic and Microstructural Studies On Co-Cr Films Investigated Using NMR

Published online by Cambridge University Press:  15 February 2011

Kazuetsu Yoshida ,
Hiroshi Kakibayashi  and
Hiroshi Yasuoka
Kazuetsu Yoshida
Affiliation:
Hitachi Ltd., Central Research Laboratory, Kokubunji, Tokyo 185
Hiroshi Kakibayashi
Affiliation:
Hitachi Ltd., Central Research Laboratory, Kokubunji, Tokyo 185
Hiroshi Yasuoka
Affiliation:
The University of Tokyo, The Institute for Solid State Physics, Roppongi, Minatoku, Tokyo 113
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Abstract

The compositional distribution of Co-Cr vacuum evaporated films is investigated using the 59Co nuclear magnetic resonance technique. The dependence of the spin-echo spectra of Co-Cr films and powders on Cr concentration is measured. The spectra of the films evaporated at 260°C are found to be similar to those of powder samples with the Cr concentration of approximately 6 at%, although the Cr concentration of the films is between 10 at% and 24 at%. It is concluded that the Cr concentration of the ferromagnetic regions in Co-Cr films remains at 6 at%, although Cr concentration increased to 25 at%. The spin-echo spectra of the films evaporated at 160°C show that the Cr concentration in ferromagnetic regions is slightly higher than that found in the films deposited at 265 °C. This implies that segregation is less developed in the 160°C films The relationship between the magnetic properties and the segregation is also discussed

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 232: Symposium T – Magnetic Materials: Microstructure and Properties , 1991 , 47
Copyright
Copyright © Materials Research Society 1991

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References

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