Low Temperature Physics: 36, 736 (2010); https://doi.org/10.1063/1.3490859 (5 pages)
Fizika Nizkikh Temperatur: Volume 36, Number 8-9 (August 2010), p. 926-932 ( to contents , go back )
Spin wave resonances in antiferromagnets
H.A. Krug von Nidda
Center for Electronic Correlations and Magnetism EKM, Experimentalphysik V Universitдt Augsburg, Augsburg, D-86135, Germany
L.E. Svistov, and L.A. Prozorova
P.L. Kapitza Institute for Physical Problems, 2 Kosygina Str., Moscow 119334, Russia
Received December 22, 2009
Spin wave resonances with enormously large wave numbers corresponding to wave vectors k ~ 105 –106 cm–1 are observed in thin plates of FeBO3. The spin-wave resonance study allows one to obtain information on spin wave spectrum. The temperature dependence of inhomogeneous exchange constant is determined for FeBO3. A considerable spectrum softening of magnons resulting from their interaction, is observed at temperatures above 1/3 of the Neel temperature. The excitation level of spin-wave resonances is found to depend significantly on inhomogeneous elastic deformations artificially created in the sample. A theoretical model is proposed to describe the observed effects.
PACS: 76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance.
Key words: spin-wave resonances, spin wave, antiferromagnetics.