A mean-field scaling method for first- and second-order phase transition ferromagnets and its application in magnetocaloric studies
authors Amaral, JS; Silva, NJO; Amaral, VS
nationality International
journal APPLIED PHYSICS LETTERS
abstract We present a method based on mean-field theory, where from scaling of experimental magnetization data, the mean-field exchange parameter lambda and the f function of the equation of state M= f [(H + H-exch)/T] are directly determined. The scaling approach allows finding the dependence of Hexch on T or higher powers of M, which determine the order of the phase transition. Within the thermodynamics of the mean-field theory, the magnetocaloric effect is obtained, in a straightforward way, from the magnetic equation of state. Results are presented for first- and second-order magnetic phase transitions in manganites and metastable nanocrystalline metal alloy. (C) 2007 American Institute of Physics.
publisher AMER INST PHYSICS
issn 0003-6951
year published 2007
volume 91
issue 17
digital object identifier (doi) 10.1063/1.2801692
web of science category Physics, Applied
subject category Physics
unique article identifier WOS:000250468200054
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journal impact factor 3.597
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