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Abstract
AbstractThe two‐dimensional (2D) Heisenberg model with spin S = 1, with the exchange anisotropy plus a second‐order uniaxial single‐site anisotropy and an external transverse magnetic field is treated by the Tyablikov (Random Phase Approximation: RPA) decoupling of the exchange interaction term and the Anderson‐Callen decoupling of the anisotropy term. The orientation of the magnetization is determined by the expectation values 〈Sα〉 (α = x, z) of the spin components from which the orientation angle θ is obtained as a function of the temperature and of the transverse magnetic field for various parameters of the exchange anisotropy in the (x,y)‐plane. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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