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

doi:10.1109/TJMJ.1991.4565120

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

Advanced Interdisciplinary Research Division

Research output: Contribution to journal › Article › peer-review

Abstract

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 language	English
Pages (from-to)	112-119
Number of pages	8
Journal	IEEE Translation Journal on Magnetics in Japan
Volume	6
Issue number	2
DOIs	https://doi.org/10.1109/TJMJ.1991.4565120
Publication status	Published - 1991 Feb

ASJC Scopus subject areas

Engineering (miscellaneous)
Engineering(all)

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

abstract = "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 {\AA} in order to obtain a high initial permeability more than 2000.",

author = "Migaku Takahashi and H. Uwazumi and T. Shimatsu and T. Sato and Minoru Takahashi and T. Wakiyama",

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AU - Takahashi, Migaku

AU - Uwazumi, H.

AU - Shimatsu, T.

AU - Sato, T.

AU - Takahashi, Minoru

AU - Wakiyama, T.

PY - 1991/2

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AB - 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.

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