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Field‐induced magnetic reorientation in ultrathin ferromagnetic films: Phase diagrams
Author(s) -
Ilkovič V.
Publication year - 2010
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200945422
Subject(s) - condensed matter physics , magnetic field , magnetization , ferromagnetism , magnetic anisotropy , anisotropy , materials science , physics , quantum mechanics
The magnetic reorientation transition can be induced by applying an external transverse magnetic field. The magnetic field at which the magnetization reaches the field direction is called the reorientation magnetic field. The reorientation magnetic field in ultrathin ferromagnetic films is studied within the framework of the many‐body Green function theory. The model Hamiltonian includes a Heisenberg term with 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 magnetic field $h_{0R}^x$ as a function of the surface single‐ion anisotropic parameter $K_{2,S} (T \to 0)$ for different: film thicknesses L , surface exchange coupling enhancements Δ S , temperatures, T and as a function of the temperature for different film thicknesses L .