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The reorientation temperature in ultrathin ferromagnetic films
Author(s) -
Ilkovič V.
Publication year - 2009
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.200945151
Subject(s) - condensed matter physics , anisotropy , ferromagnetism , decoupling (probability) , transverse plane , ion , magnetic field , hamiltonian (control theory) , magnetic anisotropy , materials science , physics , magnetization , optics , quantum mechanics , mathematical optimization , mathematics , engineering , structural engineering , control engineering
The 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 T R (a) as a function of the surface single‐ion anisotropic parameter K 2,S ( T → 0) for different: film thicknesses L , surface exchange coupling enhancements Δ S , transverse magnetic fields h 0 xand (b) as a function of the transverse magnetic field h 0 xfor different: film thicknesses L , surface exchange coupling enhancements Δ S , surface single‐ion anisotropic parameters K 2,S ( T → 0).