1. Spin-wave propagation through a magnonic crystal in a thermal gradient
- Author
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Alexander A. Serga, Vitaliy I. Vasyuchka, Burkard Hillebrands, Andrii V. Chumak, Dmytro A. Bozhko, Sergiy A Bunyaev, Gleb N. Kakazei, and Thomas Langner
- Subjects
Materials science ,Acoustics and Ultrasonics ,Condensed matter physics ,Band gap ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Crystal ,Temperature gradient ,Wavelength ,Transmission (telecommunications) ,Volume (thermodynamics) ,Spin wave ,0103 physical sciences ,010306 general physics ,0210 nano-technology ,Absolute zero - Abstract
The properties of a magnonic crystal are expected to be strongly influenced by the presence of a thermal gradient. We investigated the propagation of backward volume and surface magnetostatic spin-waves in a 1D magnonic crystal (MC) exposed to a continuous spatial temperature gradient. It is shown that the thermal gradient applied along the propagation direction leads to a frequency shift and a modification of the transmission characteristics of the spin-waves. The frequency shift is caused by a variation in saturation magnetization due to the change in absolute temperature. The altered transmission manifests itself in a broadening of MC band gaps and the corresponding narrowing of the MC passbands and is understood to be a result of a spatial transformation of the spin-waves wavelengths in a thermal gradient. Furthermore, the transmission characteristics of spin-waves in a thermal gradient have been verified by numerical calculations based on the approach of the transmission matrix. The results of the calculations demonstrate a good agreement with the experimentally measured data.
- Published
- 2018
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