Inelastic neutron scattering study of magnon excitation by ultrasound injection in yttrium iron garnet

Author:

Shamoto Shin-ichi1234ORCID,Akatsu Mitsuhiro5ORCID,Chang Lieh-Jeng246ORCID,Nemoto Yuichi7,Ieda Jun'ichi3ORCID

Affiliation:

1. Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS) 1 , Tokai 319-1106, Japan

2. Department of Physics, National Cheng Kung University (NCKU) 2 , Tainan 70101, Taiwan

3. Advanced Science Research Center, Japan Atomic Energy Agency (JAEA) 3 , Tokai 319-1195, Japan

4. Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK) 4 , Tsukuba 305-0801, Japan

5. Department of Physics, Niigata University 5 , Niigata 950-2181, Japan

6. Institute of Physics, Academia Sinica 6 , Taipei 115201, Taiwan

7. Graduate School of Science and Technology, Niigata University 7 , Niigata 950-2181, Japan

Abstract

The magnon excitation by ultrasound injection in Y3Fe5O12 is studied by inelastic neutron scattering. Both longitudinal and transverse ultrasound injections enhanced the inelastic neutron scattering intensity. We analyzed the nonequilibrium magnon steady state using the effective magnon temperature model. The large deviation of the effective magnon temperature from the sample temperature is observed at the ultrasound longitudinal mode along [0, 0, 1] at ∼10 K and [1, 1, 1] at ∼140 K. This dependence suggests that the nonequilibrium steady state can be achieved only by strong spin–lattice coupling in Y3Fe5O12. The spin–lattice coupling exhibits a decrease largely above 100 K, indicating that it could be the main origin of the degradation of longitudinal spin Seebeck effect at the temperature range.

Funder

Ministry of Education, Culture, Sports, Science and Technology

Iketani Science and Technology Foundation

Publisher

AIP Publishing

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