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

近补偿磁体中的磁子-声子杂化用于热电转换和热控制

• 批准号: 20K05297
• 负责人: RAMOS Rafael
• 金额: $ 2.83万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2020
• 资助国家: 日本
• 起止时间: 2020-04-01 至 2021-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-20K05297/
• 关键词: Spintronics; Magnons; Phonons; spin Seebeck; magnetic compensation; Spin Caloritronics; Thermoelectricity; Magnetic materials; Magnetic oxides

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.

该项目研究磁绝缘体中自旋晶格相互作用效应，特别是Ga取代钇铁石榴石（Ga-YIG）中磁补偿对自旋热转换（自旋塞贝克效应：SSE）的影响，随着Ga取代量的增加，磁补偿增加。我通过液相外延优化了高质量Ga-YIG的生长，结构质量通过X射线衍射证实。在比 YIG 低的磁场下，SSE 电压出现峰值，证实了薄膜具有更大的补偿和高磁性质量。需要对生长的薄膜进行进一步的自旋输运研究，以研究磁补偿对磁振子-声子杂化的作用及其对自旋热转换性能的影响。

项目成果

Observation of quantum interference conductance fluctuations in metal rings with strong spin-orbit coupling

• DOI: 10.1063/5.0031708
• 发表时间: 2020-12-14
• 期刊: APPLIED PHYSICS LETTERS
• 影响因子: 4
• 作者: Ramos, R.;Makiuchi, T.;Saitoh, E.
• 通讯作者: Saitoh, E.

Direct imaging of current-induced antiferromagnetic switching revealing a pure thermomagnetoelastic switching mechanism

电流感应反铁磁开关的直接成像揭示了纯热磁弹性开关机制

• 发表时间: 2020
• 期刊: arXiv
• 作者: H. Meer;F. Schreiber;C. Schmitt;R. Ramos;E. Saitoh;O. Gomonay;J. Sinova;L. Baldrati;M. Klaui
• 通讯作者: M. Klaui

Efficient Spin Torques in Antiferromagnetic CoO/Pt Quantified by Comparing Field- and Current-Induced Switching

• DOI: 10.1103/physrevlett.125.077201
• 发表时间: 2020-08-10
• 期刊: PHYSICAL REVIEW LETTERS
• 影响因子: 8.6
• 作者: Baldrati, L.;Schmitt, C.;Klaeui, M.
• 通讯作者: Klaeui, M.

Concurrent magneto-optical imaging and magneto-transport readout of electrical switching of insulating antiferromagnetic thin films

• DOI: 10.1063/5.0011852
• 发表时间: 2020-04
• 期刊: arXiv: Mesoscale and Nanoscale Physics
• 作者: F. Schreiber;L. Baldrati;C. Schmitt;R. Ramos;E. Saitoh;R. Lebrun;M. Kläui

Identification of Néel Vector Orientation in Antiferromagnetic Domains Switched by Currents in NiO/Pt Thin Films

• DOI: 10.1103/physrevapplied.15.034047
• 发表时间: 2020-08
• 期刊: arXiv: Materials Science
• 作者: C. Schmitt;L. Baldrati;L. Sánchez-Tejerina;F. Schreiber;A. Ross;M. Filianina;S. Ding;F. Fuhrmann-F.-Fuh