The effect of initial growth layer on magnetic properties of Co-Cr films

O. Kitakami, Y. Ogawa, H. Fujiwara, F. Kugiya, M. Suzuki

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The effect of a Ti underlayer on the magnetic properties of Co-Cr films was investigated. Although the existence of a Ti underlayer does not improve the crystallographic orientation of Co-Cr films, it increases their perpendicular coercive force. In order to clarify the cause of this phenomenon, the film thickness dependence of the magnetic properties of Co-Cr films was investigated. As a result, it was revealed that the coercive force of a Co-Cr fails deposited directly on a polyimide substrate decreases drastically when it becomes thinner than 50nm, whereas in the case of Co-Cr film on a Ti underlayer, a high coercive force is maintained even when it becomes as thin as 20nm. According to our observation of cross-sectional structures, the Co-Cr film with the Ti underlayer has a distinct uniform columnar structure, whereas the Co-Cr film without the Ti underlayer has a 50nm thick initial growth layer which has no clear structure. Moreover, according to the measurements of temperature-dependence of magneticproperties and observations of segregated microstructures in Co-Cr films, it was found that the improvement of magneticproperties by the insertion of the Ti underlayer was mainly due to the improvement of shape anisotropy which was caused by forming a distinctly segregated microstructure.

Original languageEnglish
Pages (from-to)2353-2355
Number of pages3
JournalIEEE Transactions on Magnetics
Volume24
Issue number6
DOIs
Publication statusPublished - 1988 Nov
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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    Kitakami, O., Ogawa, Y., Fujiwara, H., Kugiya, F., & Suzuki, M. (1988). The effect of initial growth layer on magnetic properties of Co-Cr films. IEEE Transactions on Magnetics, 24(6), 2353-2355. https://doi.org/10.1109/20.92107