Weak Ferromagnetism of Mn(HCOO)_2・2H_2O

概要

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The weak ferromagnetism of Mn(HCOO)_2・2H_2O is studied by torque measurement below 3.7°K. The direction of the ferromagnetic moment is parallel to the c-axis above 1.7°K and to the b-axis below this temperature. The magnitude of the ferromagnetic moment in the low temperature phase (1.1 × 10^3emu/mole at 1.3°K) is considerably larger than that in the high temperature phase (1.9 × 10^2emu/mole at 2.0°K). It is pointed out that the difference can be explained by considering both of Dzyalcshinsky-Moriya and NiF_2-type mechanisms. The effect of the external magnetic field on the phase change at 1.7°K is studied by observing transitions induced by the external field at temperatures near 1.7°K. The transition is detected by measuring dM/dH as a function of H. The angular dependence of the flopping field at 1.3°K and the temperature dependence of the flopping field can be explained by a conventional theory.
社団法人日本物理学会の論文
1967-02-05