Nonlinear Seebeck effect in Ni81Fe19|Pt at room temperature

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-06-27 DOI:10.1063/5.0269578

Y. Hirata, T. Kikkawa, H. Arisawa, E. Saitoh

引用次数: 0

Abstract

The nonlinear Seebeck effect, nonlinear conversion of a temperature gradient into an electric current, was observed at room temperature. Based on a second-harmonic lock-in method combined with an a.c. temperature gradient, ∇T, we measured a nonlinear Seebeck voltage in NiFe|Pt bilayers at 300 K, the amplitude of which increases in proportion to (∇T)2. We also observed that the nonlinear Seebeck voltage increases as the sample length along the ∇T direction decreases, showing a characteristic scaling law distinct from the conventional linear Seebeck effect. We developed a phenomenological model for the nonlinear Seebeck effect incorporating the spin-current induced modulation of the Seebeck coefficient, which well reproduces the experimental results.

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室温下ni81fe19|pt中的非线性塞贝克效应

在室温下观察到非线性塞贝克效应，即温度梯度非线性转换为电流。基于结合交流温度梯度∇T的二次谐波锁相方法，我们测量了300 K时NiFe|Pt双层中的非线性塞贝克电压，其振幅与（∇T）2成比例增加。我们还观察到非线性塞贝克电压随着样本长度沿∇T方向的减小而增大，呈现出不同于传统线性塞贝克效应的特征标度规律。我们建立了包含自旋电流诱导的塞贝克系数调制的非线性塞贝克效应的现象学模型，该模型很好地再现了实验结果。

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

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.