Quantitative noncontact measurement of thermal Hall angle and transverse thermal conductivity by lock-in thermography

作     者：Takumi Imamura Takamasa Hirai Koichi Oyanagi Ryo Iguchi Kenta Takamori Satoru Kobayashi Ken-ichi Uchida 

作者机构：Research Center for Magnetic and Spintronic Materials National Institute for Materials Science Tsukuba 305-0047 Japan Graduate School of Science and Technology University of Tsukuba Tsukuba 305-8573 Japan Faculty of Science and Engineering Iwate University Morioka 020-8551 Japan Department of Advanced Materials Science Graduate School of Frontier Sciences The University of Tokyo Kashiwa 277-8561 Japan 

出 版 物：《Physical Review Applied》 (Phys. Rev. Appl.)

年 卷 期：2025年第23卷第2期

页      面：024018-024018页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：Japan Society for the Promotion of Science, JSPS National Institute for Materials Science, NIMS Exploratory Research for Advanced Technology, ERATO, (JPMJER2201) Japan Science and Technology Agency, JST, (22H04965, 22K20495, 21K14519) 

主　　题：Thermography (imaging) 

摘      要：We propose and demonstrate a quantitative noncontact measurement method for the thermal Hall effect (THE) based on magnetic-field-modulated lock-in thermography (LIT). This method enables visualization of THE-induced temperature change and quantitative estimation of the thermal Hall angle θTHE by applying periodic magnetic fields to a sample and obtaining the first-harmonic response of thermal images. By combining this method with LIT-based measurement techniques for the longitudinal thermal conductivity κxx, we also quantify the transverse thermal conductivity κxy. We validate our measurement methods by estimating θTHE, κxx, and κxy in a ferromagnetic Heusler alloy Co2MnGa slab showing large THE.