Abstract
Using an effective Heisenberg model for clusters the spin-wave spectrum is calculated by direct diagonalization. The inclusion of a nonuniform magnetization profile at zero temperature, nonuniform exchange interactions as a result of structural relaxations, longer-range interactions, and of magnetic surface anisotropy have been studied. Very small effects are found on the thermal magnetic properties relative to those predicted for the simple nearest-neighbor Heisenberg model by Hendriksen, Linderoth, and Lindgard [J. Phys. C 31, 5675 (1993); Phys. Rev. B 48, 7259 (1993)].
Original language | English |
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Journal | Physical Review B |
Volume | 49 |
Issue number | 17 |
Pages (from-to) | 12291-12294 |
ISSN | 0163-1829 |
DOIs | |
Publication status | Published - 1994 |