Spin wave resonances in antiferromagnets

Details Spin wave resonances in antiferromagnets Spin wave resonances in antiferromagnets

2010-06-27

arxiv.org/abs/1006.5192v1

Low Temp. Phys. v. 36, p. 736 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 6 figures

Scientific paper

10.1063/1.3490859

Spin wave resonances with enormously large wave numbers corresponding to wave vectors 10^5-10^6 cm^{-1} are observed in thin plates of FeBO3. The study of spin wave resonances allows one to obtain information about the spin wave spectrum. The temperature dependence of a non-uniform exchange constant is determined for FeBO3. Considerable softening of the magnon spectrum resulting from the interaction of magnons, is observed at temperatures above 1/3 of the Neel temperature. The excitation level of spin wave resonances is found to depend significantly on the inhomogeneous elastic distortions artificially created in the sample. A theoretical model to describe the observed effects is proposed.

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