期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 321, 期 1, 页码 L1-L3出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2008.07.004
关键词
Magnetic refrigeration; Magnetocaloric effect
The magnetic field-induced entropy change in a ferromagnet undergoing a second-order phase transition at the Curie point is maximum near that point. The maximum magnetic entropy change, (-Delta S)(max), is demonstrated to contain, besides the usual term in H-2/3, a small negative term independent of H. Spatial inhomogeneity of real ferromagnetic materials is shown to be the origin of the off-set term, whose magnitude proves proportional to the width of the distribution of local Curie points. (c) 2008 Elsevier B.V. All rights reserved.
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