Large Anomalous Nernst Angle in Co2MnGa Thin Film

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2022-04-13 DOI:10.1109/LMAG.2022.3167332

Junfeng Hu;Yao Zhang;Xiayu Huo;Ningsheng Li;Song Liu;Dapeng Yu;Jean-Philippe Ansermet;Simon Granville;Haiming Yu

引用次数: 1

Abstract

The new trends for anomalous Nernst effect (ANE)-based thermoelectric devices require materials with large ANE values to realize the scalable generation of voltage. Recently, very large ANE values have been observed in single crystals of some novel magnetic materials. However, to allow work to proceed on developing ANE-based devices, these materials need to be produced in thin-film form, and to date, thin films have not achieved the same large ANE values as bulk materials. In this letter, we report a large ANE in a 50 nm thick film of ferromagnetic Heusler alloy Co ₂ MnGa, matching the values achieved in the bulk material. By systematically mapping the thermoelectric transport properties, we extracted an anomalous Nernst angle in the range of 11.5% –14.2% at 300 K.

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Co2MnGa薄膜中的大异常能斯特角

基于反常能斯特效应（ANE）的热电器件的新趋势需要具有大ANE值的材料来实现电压的可扩展生成。最近，在一些新型磁性材料的单晶中观察到非常大的ANE值。然而，为了使开发基于ANE的器件的工作得以进行，这些材料需要以薄膜形式生产，并且到目前为止，薄膜还没有达到与大块材料相同的大ANE值。在这封信中，我们报道了在50 nm厚的铁磁Heusler合金Co2MnGa膜中的大ANE，与在体材料中获得的值相匹配。通过系统地绘制热电输运特性，我们在300 K下提取了11.5%-14.2%范围内的异常能斯特角。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.