SPIN WAVES IN THE SPIN-FLOP PHASE OF AN ANTIFERROMAGNET, AND METASTABILITY OF THE SPIN-FLOP TRANSITION
PENNSYLVANIA UNIV PHILADELPHIA
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The spin-flop transition in a uniaxial antiferromagnet defines three critical fields that of the true thermodynamic transition and those limiting the local stability of antiferromagnetic and spin-flop phases. The latter two are calculated by a spin-wave analysis. The results are in qualitative agreement with the hysteresis observed by Schelleng and Friedberg in the spin-flop transition in manganese bromide. The spin-wave spectrum of the spin-flop phase is given, and the magnetization in the spin-flop phase is found to increase more rapidly that linearly with field because of quantum corrections absent in molecular field theory.
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