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VOLUME 87 | ISSUE 12 | PAGE 803
Comment on «Generalized Stoner-Wohlfarth Model and the Non-Langevin Magnetism of Single-Domain Particles" by M. A. Chuev
E. De Biasi+*, R. D. Zysler*, C. A. Ramos*, M. Knobel+
+Instituto de Fsica Gleb Wataghin (IFGW), Universidade Estadual de Campinas (UNICAMP), CP 6165 Campinas, S.P. Brazil.
*Centro Atómico Bariloche, CP 8400 S.C. de Bariloche, RN, Argentina

PACS: 61.18.Fs, 61.46.+w, 75.50.Tt, 75.60.Ej
In this work we analyzed the model by M. A. Chuev recently published [JETP Letters 85, 611 (2007)]. Near the blocking temperature we show that the anisotropy corrections always lead to a lower magnetization than the equilibrium value, contrary to the findings in Chuev's work. Also we show that the asymptotic high-temperature limit of Chuev's model is not in agreement with the expected thermodynamic limit. Moreover, even at low-temperature only a careful implementation of this theory can guarantee arriving to the correct result, avoiding some wrong conclusions in Chuevs work.

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