Effect of surface orientation and thickness on the magnetization of anisotropic FCC ferromagnetic films |
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| Institution: | 1. Istituto di Elettronica Quantistica, Consiglio Nazionale delle Ricerche, Via Panciatichi 56/30, I-50127 Firenze, Italy;2. Istituto Nazionale per la Fisica della Materia, Unità di Firenze, Largo E. Fermi 2, I-50125 Firenze, Italy;3. Dipartimento di Fisica, Università di Firenze, Largo E. Fermi 2, I-50125 Firenze, Italy;1. Departmento de Fı́sica, Cinvestav, Apartado Postal 14-740, México D.F. 07000, Mexico;2. Instituto de Ciencias Nucleares, UNAM, Circuito Exterior, Apartado Postal 70-543, México D.F. 04510, Mexico;1. Shankarrao Mohite Mahavidyalaya, Akluj. Dist: Solapur 413 101, India;2. Department of Electronics, Shivaji University, Kolhapur 416 004, India |
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| Abstract: | The dependence on temperature of the layer magnetization of a Heisenberg ferromagnetic ultrathin film in presence of magnetocrystalline single-ion anisotropy was theoretically investigated in the framework of a Green's function approach using the random phase approximation (RPA). The effect of surface orientation and of film thickness N on the Curie temperature TC was carefully investigated in the case of face centered cubic (FCC) films: the steepest increase of TC(N) was found in the case of the FCC(1 1 1) orientation and the smoothest in the FCC(1 1 0) one. Our results for TC(N) were successfully fitted by a finite-size scaling relation TC(∞)−TC(N)]/TC(N)=(N/N0)−λ, giving a shift exponent λ≃1.5, irrespectively of the surface orientation. Finally, the temperature evolution of the magnetization profile was analyzed, as well as its limiting shape at TC. |
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