Abstract
AbstractThe reorientation temperature in ultrathin ferromagnetic films is studied within the framework of the many‐body Green function theory. The model Hamiltonian includes a Heisenberg term with the different surface exchange couplings with respect to the bulk one, a second‐order single‐ion anisotropy, and a transverse external magnetic field in the x‐direction. The single‐ion anisotropy term is treated by the generalized Anderson–Callen decoupling scheme. We investigate the reorientation temperature TR (a) as a function of the surface single‐ion anisotropic parameter K2,S(T → 0) for different: film thicknesses L, surface exchange coupling enhancements ΔS, transverse magnetic fields h and (b) as a function of the transverse magnetic field h for different: film thicknesses L, surface exchange coupling enhancements ΔS, surface single‐ion anisotropic parameters K2,S(T → 0).
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