A mean-field scaling method for first- and second-order phase transition ferromagnets and its application in magnetocaloric studies


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.




Amaral, JS; Silva, NJO; Amaral, VS

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