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Spin reorientation transition: phase diagrams and entropy change

Published online by Cambridge University Press:  21 March 2011

Vittorio Basso
Istituto Nazionale di Ricerca Metrologica, Strada delle Cacce 91, I-10135, Torino, Italy
Carlo P. Sasso
Istituto Nazionale di Ricerca Metrologica, Strada delle Cacce 91, I-10135, Torino, Italy
Michaela Kuepferling
Istituto Nazionale di Ricerca Metrologica, Strada delle Cacce 91, I-10135, Torino, Italy
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In 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.

Research Article
Copyright © Materials Research Society 2011

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