TY - JOUR
T1 - Composition-tunable magnon-polaron anomalies in spin Seebeck effects in epitaxial Bix Y3-xFe5 O12 films
AU - Kikkawa, Takashi
AU - Oyanagi, Koichi
AU - Hioki, Tomosato
AU - Ishida, Masahiko
AU - Qiu, Zhiyong
AU - Ramos Amigo, Rafael Enrique
AU - Hashimoto, Yusuke
AU - Saitoh, Eiji
N1 - Funding Information:
The authors thank S. Ito and Y. Murakami from Institute for Materials Research, Tohoku University, for performing transmission electron microscopy and electron probe microanalysis on our samples, respectively. This work was supported by ERATO “Spin Quantum Rectification Project” (No. JPMJER1402) and CREST (No. JPMJCR20C1 and No. JPMJCR20T2) from JST, Japan, Grant-in-Aid for Scientific Research (Grants No. JP19H05600, No. JP20H02599, No. JP20K22476, No. JP21K14519, No. JP22K14584, and No. JP22K18686) and Grant-in-Aid for Transformative Research Areas (No. JP22H05114) from JSPS KAKENHI, Japan, NEC Corporation, and Institute for AI and Beyond of the University of Tokyo. Z.Q. acknowledges support from the National Natural Science Foundation of China (Grants No. 11874098 and No. 52171173). R.R. acknowledges support from the European Commission through the Project 734187-SPICOLOST (H2020-MSCA-RISE-2016), the European Union's Horizon 2020 research and innovation program through the MSCA grant agreement SPEC-894006, Grant RYC 2019-026915-I funded by the MCIN/AEI/ 10.13039/501100011033 and by “ESF investing in your future”, the Xunta de Galicia (ED431B 2021/013, Centro Singular de Investigación de Galicia Accreditation 2019-2022, ED431G 2019/03) and the European Union (European Regional Development Fund - ERDF).
Publisher Copyright:
© 2022 American Physical Society.
PY - 2022/10
Y1 - 2022/10
N2 - We have investigated hybridized magnon-phonon excitation (magnon polarons) in spin Seebeck effects (SSEs) in BixY3-xFe5O12 (BixY3-xIG; x=0, 0.5, and 0.9) films with Pt contact. We observed sharp peak structures in the magnetic field H dependence of the longitudinal SSE (LSSE) voltages, which appear when the phonon dispersions are tangential to the magnon dispersion curve in BixY3-xIG. By increasing the Bi amount x, the peak fields in the LSSE shift toward lower H values due to the reduction of the sound velocities in BixY3-xIG. We also measured the SSE in a nonlocal configuration and found that magnon-polaron anomalies appear with different signs and intensities. Our result shows composition-tunability of magnon-polaron anomalies and provides a clue to further unravel the physics of magnon-polaron SSEs.
AB - We have investigated hybridized magnon-phonon excitation (magnon polarons) in spin Seebeck effects (SSEs) in BixY3-xFe5O12 (BixY3-xIG; x=0, 0.5, and 0.9) films with Pt contact. We observed sharp peak structures in the magnetic field H dependence of the longitudinal SSE (LSSE) voltages, which appear when the phonon dispersions are tangential to the magnon dispersion curve in BixY3-xIG. By increasing the Bi amount x, the peak fields in the LSSE shift toward lower H values due to the reduction of the sound velocities in BixY3-xIG. We also measured the SSE in a nonlocal configuration and found that magnon-polaron anomalies appear with different signs and intensities. Our result shows composition-tunability of magnon-polaron anomalies and provides a clue to further unravel the physics of magnon-polaron SSEs.
UR - http://www.scopus.com/inward/record.url?scp=85140270622&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85140270622&partnerID=8YFLogxK
U2 - 10.1103/PhysRevMaterials.6.104402
DO - 10.1103/PhysRevMaterials.6.104402
M3 - Article
AN - SCOPUS:85140270622
SN - 2475-9953
VL - 6
JO - Physical Review Materials
JF - Physical Review Materials
IS - 10
M1 - 104402
ER -