Weak ferromagnetism of Mn(HCOO)2・2H2O

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  • Yamagata Kazuo
    The Institute for Solid State Physics, The University of Tokyo Department of Physics, Faculty of Science, Kobe University

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  • Weak Ferromagnetism of Mn(HCOO)<SUB>2</SUB>·2H<SUB>2</SUB>O

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The weak ferromagnetism of Mn(HCOO)2·2H2O 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 (1.1×103emu/mole at 1.3°K) is considerably larger than that in the high temperature phase (1.9×102emu/mole at 2.0°K). It is pointed out that the difference can be explained by considering both of Dzyalcshinsky-Moriya and NiF2-type mechanisms.<BR>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.

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