Microwave absorption in the frustrated ferrimagnet Cu2OSeO3

Автор(и)

  • M.I. Kobets B.Verkin Institute for Low Temperature Physics and Engineering National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
  • K.G. Dergachev B.Verkin Institute for Low Temperature Physics and Engineering National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
  • E.N. Khatsko B.Verkin Institute for Low Temperature Physics and Engineering National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
  • A.I. Rykova B.Verkin Institute for Low Temperature Physics and Engineering National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
  • P. Lemmens Institute for Condensed Matter Physics, TU Braunschweig, D-38106 Braunschweig, Germany
  • D. Wulferding Institute for Condensed Matter Physics, TU Braunschweig, D-38106 Braunschweig, Germany
  • H. Berger Institute de Physique de la Matiere Complexe, EPFL, CH-1015 Lausanne, Switzerland

DOI:

https://doi.org/10.1063/1.3319505

Ключові слова:

ferrimagnet materials, frequency-field dependence, magnetization precession.

Анотація

The resonance properties of a new Cu2OSeO3 ferrimagnet have been investigated in a wide range of frequencies (17–142 GHz) at liquid helium temperature. The resonance data were used to plot the frequencyfield dependence of the ferrimagnetic spectrum described within the model of an anisotropic two-sublattice ferrimagnet. The effective magnetic anisotropy corresponding to the gap in the spin wave spectrum has been estimated (3 GHz). It is found that the spectrum has a multicomponent structure which is due to the diversity of the types of magnetization precession. As the amplitude of the high-frequency magnetic field increased, an additional absorption was observed in the external magnetic field lower than the field of the main resonance. The detected additional absorption corresponds to the nonuniform nonlinear parametric resonance, connected with nonuniformity of magnetic structure in the ferrimagnetic crystal Cu2OSeO3.

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Опубліковано

2009-12-25

Як цитувати

(1)
Kobets, M.; Dergachev, K.; Khatsko, E.; Rykova, A.; Lemmens, P.; Wulferding, D.; Berger, H. Microwave Absorption in the Frustrated Ferrimagnet Cu2OSeO3. Fiz. Nizk. Temp. 2009, 36, 223-226.

Номер

Том 36 № 2 (2010)

Розділ

Низькотемпературний магнетизм

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