Magnon-phonon hybridization in nearly compensated magnets for thermoelecric conversion and heat control

2020 年度 実績報告書

• 研究課題/領域番号: 20K05297
• 研究機関: 東北大学
• 研究代表者: RAMOS Rafael 東北大学, 材料科学高等研究所, 助教 (40839312)
• 研究期間 (年度): 2020-04-01 – 2021-03-31
• キーワード: Spintronics / Magnons / Phonons / spin Seebeck / magnetic compensation

研究実績の概要

The project deals with the investigation of spin-lattice interaction effects in magnetic insulators, in particular the effect of magnetic compensation on spin-heat conversion (spin Seebeck effect: SSE) in Ga-substituted yttrium iron garnet (Ga-YIG), with increasing Ga-substitution the magnetic compensation increases.
I optimized the growth of high-quality Ga-YIG by liquid phase epitaxy, the structural quality was confirmed by x-ray diffraction. The presence of peaks in the SSE voltage at lower magnetic field than in YIG confirm the larger compensation and high magnetic quality of the films.
Further spin transport studies on the grown films are to be performed to investigate the role of magnetic compensation on magnon-phonon hybridization and its effect on the spin-heat conversion properties.

研究成果

• [雑誌論文] Efficient Spin Torques in Antiferromagnetic CoO/Pt Quantified by Comparing Field- and Current-Induced Switching (2020)
  • 著者名/発表者名: L. Baldrati, C. Schmitt, O. Gomonay, R. Lebrun, R. Ramos, E. Saitoh, J. Sinova, M. Klaui
  • 雑誌名: Physical Review Letters 巻: 125 ページ: 077201
  • DOI: 10.1103/PhysRevLett.125.077201
  • 査読あり / 国際共著
• [雑誌論文] Concurrent magneto-optical imaging and magneto-transport readout of electrical switching of insulating antiferromagnetic thin films (2020)
  • 著者名/発表者名: F. Schreiber, L. Baldrati, C. Schmitt, R. Ramos, E. Saitoh, R. Lebrun, M. Klaui
  • 雑誌名: Applied Physics Letters 巻: 117 ページ: 082401
  • DOI: 10.1063/5.0011852
  • 査読あり / 国際共著
• [雑誌論文] Identification of Neel vector orientation in antiferromagnetic domains switched by currents in NiO/Pt thin films (2020)
  • 著者名/発表者名: C. Schmitt, L. Baldrati, L. Sanchez-Tejerina, F. Schreiber, A. Ross, M. Filianina, S. Ding, F. Fuhrmann, R. Ramos, F. Maccherozzi, D. Backes, E. Saitoh, G. Finocchio, M. Klaui
  • 雑誌名: arXiv 巻: 2008.08507 ページ: -
  • 国際共著
• [雑誌論文] Direct imaging of current-induced antiferromagnetic switching revealing a pure thermomagnetoelastic switching mechanism (2020)
  • 著者名/発表者名: H. Meer, F. Schreiber, C. Schmitt, R. Ramos, E. Saitoh, O. Gomonay, J. Sinova, L. Baldrati, M. Klaui
  • 雑誌名: arXiv 巻: 2008.05219 ページ: -
  • 国際共著
• [雑誌論文] Observation of quantum interference conductance fluctuations in metal rings with strong spin-orbit coupling (2020)
  • 著者名/発表者名: R. Ramos, T. Makiuchi, T. Kikkawa, S. Daimon, K. Oyanagi, E. Saitoh
  • 雑誌名: arXiv 巻: 2010.01300 ページ: -