Weak Ferromagnetism of Mn(HCOO)2·2H2O

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Abstract
The weak ferromagnetism of Mn(HCOO) 2 ·2H 2 O 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 3 emu/mole at 1.3°K) is considerably larger than that in the high temperature phase (1.9×10 2 emu/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 d M /d H 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.

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