Physics of the Solid State
Volumes and Issues
The effect of van Hove singularities on spin pumping in the magnonic crystal/normal metal structure
Vysotskii S. L. 1,2, Nikulin Y. V. 1,2, Dudko G. M. 1, Sakharov V. K. 1,2, Kozhevnikov A. V. 1, Seleznev M. E. 1,2, Khivintsev Y. V. 1,2, Khitun A. G.3, Nikitov S. A. 4, Filimonov Y. A. 1,2,5
1Saratov Branch, Kotel’nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Saratov, Russia
2Saratov State University, Saratov, Russia
3Department of Electrical and Computer Engineering, University of California-Riverside, Riverside, USA
4Kotelnikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Moscow, Russia
5Yuri Gagarin State Technical University of Saratov, Saratov, Russia
Email: yuri.a.filimonov@gmail.com

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Using the inverse spin Hall effect, spin pumping by magnetostatic backward volume waves (MSBVW) in a structure based on a magnonic crystal from an yttrium-iron garnet film and a Pt microstrip has been studied. A resonant increase in the EMF signal at the frequencies of Bragg resonances (BR) was detected, which reflects an increase in the efficiency of spin pumping. The resonant amplification of spin pumping is explained by an increase in the efficiency of electron-magnon scattering due to the formation of dispersion regions with a high density of van Hove singularities in the MSBVW spectrum at BR frequencies. Keywords: spin pumping, spin waves, density of states, magnonic crystal, structures yttrium-iron garnet/platinum (YIG/Pt).
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