Parallel Susceptibility of Thin Ferromagnetic Films within Many-Body Green's Function Theory |
| V. Ilkovič
Department of Theoretical Physics and Astrophysics, Faculty of Science, P.J. Šafarik University, Jesenná5, 040 01 Košice, Slovak Republic and J. Kecer Department of Physics, Technical University, Park Komenského 2, 040 01 Košice, Slovak Republic |
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| Received: 9 07 2007; |
| Parallel susceptibility of the quantum Blume-Capel model for ferromagnetic films is calculated within the Green function theory. The Hamiltonian includes a Heisenberg term with the different surface exchange coupling with respect to bulk, an external magnetic field, a second-order uniaxial single-ion anisotropy, and the exchange anisotropy. The importance of collective excitations is demonstrated by comparing with result calculated within mean field approximation. |
| DOI: 10.12693/APhysPolA.113.201 PACS numbers: 75.10.Jm, 75.30.Ds, 75.30.Kz, 75.70.Ak |