Journal
NANO LETTERS
Volume 20, Issue 4, Pages 2741-2746Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c00363
Keywords
magnon-phonon interaction; thermal Hall effect; spin Nernst effect; ferrimagnet
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Funding
- Institute for Basic Science in Korea [IBS-R009-D1]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) [0426-20190008]
- POSCO Science Fellowship of POSCO TJ Park Foundation [0426-20180002]
- U.S. Army Research Office [W911NF-18-1-0137]
- JST CREST Grant, Japan [JPMJCR1874]
- JSPS KAKENHI [18H03676, 26103006]
- National Research Foundation of Korea [IBS-R009-D1-2020-A00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We theoretically study the intrinsic thermal Hall and spin Nernst effect in collinear ferrimagnets on a honeycomb lattice with broken inversion symmetry. The broken inversion symmetry allows in-plane Dzyaloshinskii-Moriya interaction between the nearest neighbors, which does not affect the linear spin wave theory. However, the Dzyaloshinskii-Moriya interaction induces large Berry curvature in the magnetoelastic excitations through the magnon-phonon interaction (MPI) to produce thermal Hall current. Furthermore, the magnetoelastic excitations transport spin, which is inherited from the magnons. Therefore, spin Nernst current accompanies the thermal Hall current. Because the MPI does not conserve the spin, we examine the spatial distribution of spin induced by a thermal gradient in the system having a stripe geometry. We find that spin is accumulated at the edges, reflecting the spin Nernst current. We also find that the total spin of the system-and, therefore, the magnetization-is changed, because of the thermal gradient and MPI.
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