Enhancement of acoustic spin pumping by acoustic distributed Bragg reflector cavity

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...

Full description

Saved in:
Bibliographic Details
Published in:Applied physics letters 2020-06, Vol.116 (25)
Main Authors: Hwang, Yunyoung, Puebla, Jorge, Xu, Mingran, Lagarrigue, Aurelien, Kondou, Kouta, Otani, Yoshichika
Format: Article
Language:English
Subjects:
Acoustic resonance
Acoustics
Applied physics
Bismuth oxides
Bismuth trioxide
Ferromagnetic resonance
Ferromagnetism
Frequency ranges
Holes
Magnons
Pumping
Spintronics
Surface acoustic waves
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0011799