Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 322, Issue 9-12, Pages 1585-1588Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2009.09.021
Keywords
Barium ferrite; Magneto-caloric
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In this paper we discuss measurements of the heat exchanged along the hysteresis loop and there turn branches of barium ferrite of composition BaFe12O19. The measurements show the joint presence of a dissipated heat, connected with the hysteresis losses, and an entropy change, connected with the ordering effect of the magnetic field on the system of magnetic spins. We demonstrate that when we try to separate the two contributions we have to conclude that the entropy cannot be a single-valued function of the magnetic field. (C) 2009 Elsevier B.V. All rights reserved.
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