Temperature Variation of the Spontaneous Hall Coefficient in Fe-Ni Invar Alloys

概要

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A measurement has been made of the spontaneous Hall coefficient $R_{\text{s}}$ in the Fe–Ni alloys containing $34.5{\sim}42$ at % Ni over the temperature range from 77 K to the Curie temperatures. In the $34.5{\sim}40$ at % Ni alloys, $R_{\text{s}}$ is proportional to $T^{2}$ at low temperatures and changes to $T^{1.0{\sim}1.4}$ dependences with increasing temperature. In the 42 at % Ni $R_{\text{s}}$ varies with $T^{4}$ in low temperature regions and with $T^{2}$ above 400 K. The temperature variations of $R_{\text{s}}$ in Invar alloys can be interpreted by the Kagan and Maksimov theory based on the mixed spin-orbit coupling between localized $d$ electrons and conductive $s$ electrons, while itinerant magnetic electron models are rather applicable to that of $R_{\text{s}}$ in the 42 at % Ni.
社団法人日本物理学会の論文
1976-02-15