Soft Magnetic Properties of Ni-Fe-Nb Alloy Films with Nearly 50 wt% Ni Concentration

Migaku Takahashi, H. Uwazumi, T. Shimatsu, T. Sato, Minoru Takahashi, T. Wakiyama

Research output: Contribution to journalArticlepeer-review


The relation between soft magnetic properties and local anisotropy fluctuation, which is strongly connected with the film micro structure, was systematically examined for Ni-Fe-Nb alloy films with nearly 50 wt% Ni. According to the micromagnetic ripple theory of Hoffmann, the effective magnetic anisotropy Ueff in each of the grains decreases drastically with increases in the number of grains N within the coupling volume. Experimental results showed that the local anisotropy fluctuation in Ni-Fe-Nb alloy films depends heavily on Ueff/Ku, and decreases with decreasing Ueff/Ku. Therefore, to realize high initial permeability in such films, it is necessary to increase N within the coupling volume by decreasing the grain size. In the cae of Ni-Fe-Nb alloy films, the grain size must be decreased to less than 200 Å in order to obtain a high initial permeability more than 2000.

Original languageEnglish
Pages (from-to)112-119
Number of pages8
JournalIEEE Translation Journal on Magnetics in Japan
Issue number2
Publication statusPublished - 1991 Feb

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Engineering(all)


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