Surface acoustic waves (SAWs) in the GHz frequency range can inject spin currents dynamically into adjacent non-magnetic layers via the spin pumping effect associated with ferromagnetic resonance. Here, we demonstrate an enhancement of acoustic ferromagnetic resonance and spin current generation by a pair of SAW reflector gratings, which form an acoustic analog of the distributed Bragg reflector cavity. In the experiment, we confirmed 2.04 ± 0.02 times larger SAW power absorption in a device with cavity than in the case of no acoustic cavity. We confirmed up to 2.96 ± 0.02 times larger spin current generation by measuring electric voltages generated by the inverse Edelstein effect at the interface between Cu and Bi2O3. The results suggest that acoustic cavities would be useful to enhance the conversion efficiency in SAW driven coupled magnon–phonon dynamics.
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Enhancement of acoustic spin pumping by acoustic distributed Bragg reflector cavity
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22 June 2020
Research Article|
June 24 2020
Enhancement of acoustic spin pumping by acoustic distributed Bragg reflector cavity
Yunyoung Hwang
;
Yunyoung Hwang
1
Institute for Solid State Physics, University of Tokyo
, Kashiwa 277-8581, Japan
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Jorge Puebla
;
Jorge Puebla
a)
2
CEMS, RIKEN
, 2-1, Hirosawa, Wako 351-0198, Japan
a)Author to whom correspondence should be addressed: jorgeluis.pueblanunez@riken.jp
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Mingran Xu
;
Mingran Xu
1
Institute for Solid State Physics, University of Tokyo
, Kashiwa 277-8581, Japan
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Aurelien Lagarrigue;
Aurelien Lagarrigue
2
CEMS, RIKEN
, 2-1, Hirosawa, Wako 351-0198, Japan
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Kouta Kondou;
Kouta Kondou
2
CEMS, RIKEN
, 2-1, Hirosawa, Wako 351-0198, Japan
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Yoshichika Otani
Yoshichika Otani
b)
1
Institute for Solid State Physics, University of Tokyo
, Kashiwa 277-8581, Japan
2
CEMS, RIKEN
, 2-1, Hirosawa, Wako 351-0198, Japan
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a)Author to whom correspondence should be addressed: jorgeluis.pueblanunez@riken.jp
b)
Electronic mail: yotani@issp.u-tokyo.ac.jp
Appl. Phys. Lett. 116, 252404 (2020)
Article history
Received:
April 24 2020
Accepted:
June 13 2020
Citation
Yunyoung Hwang, Jorge Puebla, Mingran Xu, Aurelien Lagarrigue, Kouta Kondou, Yoshichika Otani; Enhancement of acoustic spin pumping by acoustic distributed Bragg reflector cavity. Appl. Phys. Lett. 22 June 2020; 116 (25): 252404. https://doi.org/10.1063/5.0011799
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