Investigation of nonreciprocal characteristics of spin waves in their interaction with a weakly contrasting magnon crystal

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Abstract

The spatial-frequency distributions of spin waves in a magnon crystal and their dispersion characteristics have been experimentally investigated. In spite of the weak energy contrast of the crystal, the occurrence of a number of Brillouin zones and the existence of two types of wave nonreciprocity were found: one type is due to the asymmetry of dispersion dependences with respect to the direction of wave propagation, and the second type is due to the different spatial distribution of the wave when it propagates in opposite directions. The magnon crystal made it possible to detect and measure these types of nonreciprocity.

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About the authors

S. V. Gerus

Kotel’nikov Institute of Radio Engineering and Electronics of the Russian Academy of Sciences, Fryazino Branch

Author for correspondence.
Email: svg318@ire216.msk.su
Russian Federation, Fryazino, 141190

E. H. Lock

Kotel’nikov Institute of Radio Engineering and Electronics of the Russian Academy of Sciences, Fryazino Branch

Email: edwin@ms.ire.rssi.ru
Russian Federation, Fryazino, 141190

References

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Supplementary files

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2. Fig. 1. Schematic (a) and experimentally measured results (b) of the interaction of the PWV with a magnonic crystal: 1 – YIG film, 2 – magnonic crystal, 3 – stationary microwave–PWV converter, 4 – moving PWV–microwave probe-converter, 5 – complex microwave transfer coefficient meter, 6 – computer, 7 – system for moving converter 4; the PWV group velocity vector is directed at an angle ψ = 18.5° to the normal of the magnetization field o; the reciprocal lattice vectors of the magnonic crystal and PWV (a); the components of the PWV amplitude measured during the movement of the receiving probe – real (solid line) and imaginary (dashed line) (b).

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3. Fig. 2. Results of the Fourier transform of the measured complex signal; frequencies: 3000 (a, b); 3032 (c, d); 3038 MHz (d, e); positive direction (b, d, f); negative direction (a, c, d).

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4. Fig. 3. Experimental dispersion characteristics of a magnonic crystal based on the MDF structure with a magnetic signalogram, measured in the frequency range where Brillouin zones are observed; solid colored lines are waves with direct dispersion; dashed lines are waves with inverse dispersion; black solid lines are dispersion dependences of the MDF structure without a signalogram.

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