Spin reorientation transition: phase diagrams and entropy change
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ABSTRACTIn this paper we review the phase diagram and derive the entropy change for spin reorientation transitions by considering first order magnetization process theory with temperature dependent magneto-crystalline anisotropy constants. We derive the magnetic field-induced entropy change Δs for a transition between easy axis and easy plane, showing that for alternating magnetic field, Δs has a change of sign at the reorientation temperature, while for rotating magnetic field its sign is definite. We apply the model to CoZn W-type barium ferrite.
2012 ◽
Vol 26
(28)
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pp. 1250183
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1975 ◽
Vol 39
(4)
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pp. 938-948
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