Volume 61, Number 6, March 2003
|Page(s)||838 - 844|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 March 2003|
Size-dependent magnon modes of a Heisenberg ferromagnet
Division of Quantum Chemistry, University of Leuven Celestijnenlaan 200F, B-3001 Leuven, Belgium
2 Institute of Applied Physics - Chişinǎu, Moldova
Accepted: 9 January 2003
We prove the existence of new bound magnon excitations in Heisenberg ferromagnets due to finite-size effects. To describe these effects, we develop an analytical approximation which is a modification of the widely used continuum approach. Thus, for the square lattice we find 4 branches of bound two-magnon excitations in addition to the two ones known before. It is shown that some of the new modes remain well separated from all the others even for a macroscopic system.
PACS: 75.10.Jm – Quantized spin models / 75.30.Ds – Spin waves
© EDP Sciences, 2003
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