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The ordinary Hall coefficient of the amorphous ferromagnetic alloy Fe80P13C7 is 3.0×10−11 V·cm/A·G. Its spontaneous Hall coefficient is 0.6×10−9 V·cm/A·G and is independent of temperature from 4.2°K to its Curie temperature at 586°K if the ordinary Hall coefficient does not change much over the temperature range. The free electron assumption calculated by Samoilovich and Kon'Kov explains the temperature independent behavior of the spontaneous Hall coefficient.
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Sibo Lin (1969) studied this question.
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