Magnetic and electrical properties of Fe-B-N amorphous films (invited)

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  • H. Karamon
    SONY Magnetic Products Inc., Device Engineering Dept., 4-1 Sakuragi, 3-chome, Tagajo-shi, Miyagi 985, Japan
  • T. Masumoto
    The Research Institute for Iron, Steel and other Metals, Tohoku University, Sendai, 980, Japan
  • Y. Makino
    SONY Corporation Research Center, 174 Fujitsuka-cho, Hodogaya-ku, Yokohama 240, Japan

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Abstract

<jats:p>A new type of ferromagnetic amorphous alloy with a two-phase structure was found in cosputtered Fe-B-N films. The microstructure was identified to be composed of two amorphous phases with about 50 Å or less in size; one is a ferromagnetic amorphous phase of Fe-B-N alloy and the other is a nonmagnetic and high resistive amorphous phase of boron nitride. The homogeneous mixture of these two phases in the films resulted in unique features for magnetic and electrical properties. In comparison to sputtered Fe-B films, the Fe-B-N films exhibit higher saturation magnetizations and the electrical resistivity is about 3–103 times higher. The compositional dependence of Curie and crystallization temperatures also differs from those of the sputtered amorphous Fe-B films. Furthermore, the corrosion resistance of the films is improved in the presence of nitrogen.</jats:p>

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