著者

佐藤 靖之 浜本 正人 S. シュパイデル 岩田 聡 内山 晋

出版者

The Magnetics Society of Japan

雑誌

日本応用磁気学会誌 (ISSN:02850192)

巻号頁・発行日

vol.10, no.2, pp.133-136, 1986

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It is found that a large orthorhombic anisotropy is induced in (EuBi)₃Fe₅O₁₂ garnet films grown on (110) NdGG substrates. The Bi content is controlled by controlling the melt composition and the supercooling temperature. Gyorgy's parameter <i>B</i>=−2(<i>K</i>_u+<i>K</i>_p) increases linearly with the Bi content. The main part of <i>B</i> is found to be growth-induced. Gyorgy's parameter <i>A</i>=<i>K</i>_p−<i>K</i>_u is very small and almost independent of the Bi content. The growth- and stress-induced parts of <i>A</i> are found to be considerably large, but of opposite sign, and to compensate each other nearly completely, although their respective absolute values increase with increasing Bi content.<br>Magnetic properties of a (Eu_1.8 Bi_1.2) Fe₅O₁₂ film are obtained as follows: saturation magnetization 4π<i>M</i>_s = 1560 Gauss, uniaxial anisotropy <i>K</i>_u = 1.6 × 10⁵erg/cm³, in-plane anisotropy <i>K</i>_p = 1.6 × 10⁵erg/cm³, quality factor <i>Q</i> = 1.7, material length <i>l</i> = 0.06 μm and wall mobility μw = γ<i>Δ₀/<i>α</i> = 19 ms^-1. Such a film might be used as a 0.5 μm bubble material for current access devices.