Low Temperature Physics: 36, 831 (2010); https://doi.org/10.1063/1.3493440 (7 pages)
Fizika Nizkikh Temperatur: Volume 36, Number 8-9 (August 2010), p. 1041-1049    ( to contents , go back )

Resonant properties of domain walls in quasi-two-dimensional antiferromagnets

A.S. Kovalev1,3, J.E. Prilepsky1,2, E.A. Kryukov3, and N.V. Kulik3

1B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: kovalev@ilt.kharkov.ua

2Nonlinearity and Complexity Research Group, School of Engineering and Applied Science, Aston University, Aston Triangle, Birmingham, UK

3V. Karazin Kharkov National University, 4 Svobody Sq., Kharkov 61077, Ukraine
pos Анотація:

Received April 6, 2010


The «internal modes» in quasi-two-dimensional antiferromagnets, which are localized near the domain walls, are investigated. The classification of possible internal modes are provide and the frequency dependencies on the discreteness parameter λ = J / β is found. At the parameter critical value λ = λb = 3 / 4 there occurs a transition of the collinear domain wall to the canted one and the spectrum of localized modes changes essentially. Symmetrical and two antisymmetrical modes exist in the domain λ < λb and two symmetrical, one antisymmetrical and one shear modes — in the region λ > λb. For the discreteness parameter values close to the critical one some localized modes have the frequencies deep inside the gap of linear magnons spectrum. These modes may be detected experimentally.

PACS: 63.20.Pw Localized modes;
PACS: 05.45.Yv Solitons.

Key words: quasi-two-dimensional antiferromagnets, domain walls, discreteness parameter, internal modes, anticollinear limit, long wave approximation.

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