Magneto-thermoelectric effects mapping using tip-induced temperature gradient in atomic force microscopy

Frontiers in Physics

Physics

Hironari Isshiki¹  Nico Budai¹  YoshiChika Otani² 

[1] Institute for Solid State Physics, The University of Tokyo, Chiba, Japan;Institute for Solid State Physics, The University of Tokyo, Chiba, Japan;Center for Emergent Matter Science RIKEN, Saitama, Japan;

关键词: atomic force microscopy;    anomalous Nernst effect;    spin caloritronics;    magneto-thermoelectric effects;    magnetic imaging;   

DOI  :  10.3389/fphy.2023.1205556

 received in 2023-04-14, accepted in 2023-06-26,  发布年份 2023

来源: Frontiers

【 摘 要 】

Mapping magneto-thermoelectric effects, such as the anomalous Nernst effect, are crucial to optimize devices that convert thermal energy to electric energy. In this article, we show the methodology to realize this based on a technique we recently established using atomic force microscopy, in which a tip contact on the surface locally creates the temperature gradient. We can map the non-magnetic Seebeck and anomalous Nernst effects separately by investigating the magnetic field dependence. The simulation based on a simple heat transfer model between the tip and sample quantitatively explains our results. We estimated the magnitude of the anomalous Nernst effect in permalloy from the experiment and simulation to be ∼0.10 μV/K.

【 授权许可】

Unknown   
Copyright © 2023 Isshiki, Budai and Otani.