journal article·2023-02-01Open access

Anomalous Nernst effect in epitaxially grown Fe4−xNixN films

Weida Yin, Keita Ito, Yusuke Tsubowa, Masahito Tsujikawa, Masafumi Shirai, Koki Takanashi

AIP Advances· Volume 13· Issue 2

Abstract

Anomalous Nernst effect of epitaxial Fe4−xNixN films on MgAl2O4(001) substrates was characterized. The Ni/Fe ratio (x) in Fe4−xNixN films was changed in the range of 0 ≤ x ≤ 2.8, and the Fe4−xNixN phase started to decompose into FeNi at about x = 2.2. The anomalous Nernst coefficient (SANE) decreased with x from 1.7 to 0.6 μV/K and the Seebeck coefficient increased with x from −2.3 to 1.2 μV/K. The transverse thermoelectric conductivity (αxy) evaluated from the experimental data showed a decrease with x and the change of αxy dominated the change of SANE. The anomalous Hall conductivity and αxy of Fe4N and Fe2.8Ni1.2N were obtained by first-principles calculations, showing a significant difference from the experimental results, which might be caused by the contribution from the extrinsic mechanisms.
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Research context

OpenAlex topics: GaN-based semiconductor devices and materials · Thermal properties of materials · Semiconductor materials and devices

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute for Materials Research, Tohoku University 1 , Sendai 980-8577, Japan

Department of Materials Science, Graduate School of Engineering, Tohoku University 2 , Sendai 980-8579, Japan

Center for Spintronics Research Network, Tohoku University 3 , Sendai 980-8577, Japan

Research Institute of Electrical Communication, Tohoku University 4 , Sendai 980-8577, Japan

Department of Electronic Engineering, Graduate School of Engineering, Tohoku University 5 , Sendai 980-8579, Japan

Center for Science and Innovation in Spintronics, Core Research Cluster, Tohoku University 6 , Sendai 980-8577, Japan

Funding

Japan Society for the Promotion of Science · Collaborative Research Center on Energy Materials, Institute for Materials Research, Tohoku University · Cooperative Research Project of the Research Institute of Electric Communication, Tohoku University

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