Geodesic
Quantum effects of magnetization of an easy-axis ferromagnet with $S=1$
Teoretičeskaâ i matematičeskaâ fizika, Tome 173 (2012) no. 2, pp. 333-352 Cet article a éte moissonné depuis la source Math-Net.Ru

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We analyze the influence of quantum effects on magnetic properties of a strongly anisotropic easy-axis ferromagnet with single-ion anisotropy comparable to the exchange interaction of spins with $S=1$. We show that in this case, despite the quantum approach, we can apply a description inspired by the Landau theory of phase transitions. We consider two magnetization cases: by a longitudinal and by a transverse external magnetic field. We determine the critical values of the fields and find quantum corrections manifested in the so-called “shortening” of the mean spin modulus. We find that for a sufficiently large single-ion anisotropy, the angular dependence of the critical field differs from the Stoner–Wohlfarth astroid.
Keywords: quantum phase transition, single-ion anisotropy, magnetizing easy-axis ferromagnet, critical field of remagnetization of easy-axis ferromagnet. 
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V. M. Kalita; I. M. Ivanova; V. M. Loktev. Quantum effects of magnetization of an easy-axis ferromagnet with $S=1$. Teoretičeskaâ i matematičeskaâ fizika, Tome 173 (2012) no. 2, pp. 333-352. http://geodesic.mathdoc.fr/item/TMF_2012_173_2_a8/

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