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Composition dependence of the anomalous Nernst effect in Fe$$_{4-x}$$Mn$$_{x}$$N and Fe$$_{4-y}$$Co$$_{y}$$N films

Yin, W.*; 伊藤 啓太*; 坪和 優佑*; 辻川 雅人*; 白井 正文*; 梅津 理恵*; 高梨 弘毅

Yin, W.*; Ito, Keita*; Tsubowa, Yusuke*; Tsujikawa, Masahito*; Shirai, Masafumi*; Umetsu, Rie*; Takanashi, Koki

Fe$$_{4}$$N exhibits a large anomalous Nernst effect (ANE), which motivates a systematic study of enhancing the anomalous Nernst coefficient (S$$_{rm ANE}$$) by modulating its electronic and magnetic structures. In this study, Mn and Co substitution effects for Fe in Fe$$_{4}$$N on S$$_{ANE}$$ were investigated. Fe$$_{4-x}$$Mn$$_{x}$$N and Fe$$_{4-y}$$Co$$_{y}$$N films in wide ranges of x and y were grown epitaxially on MgO(001) and (LaAlO$$_{3}$$)$$_{0.3}$$(Sr$$_{2}$$TaAlO$$_{6}$$)$$_{0.7}$$(001) substrates, respectively, using molecular beam epitaxy. The S$$_{rm ANE}$$ value of the Fe$$_{4}$$N film is suppressed by substituting Fe with Mn or Co. By measuring the ANE, Seebeck effect, and anomalous Hall effect, the transverse thermoelectric conductivity ($$alpha_{xy}$$) was evaluated. The composition dependence of S$$_{ANE}$$ was dominated by the change of $$alpha_{xy}$$ for both Fe$$_{4-x}$$Mn$$_{x}$$N and Fe$$_{4-y}$$Co$$_{y}$$N films. First-principles calculations were conducted for the transverse electric conductivity ($$sigma_{xy}$$) and $$alpha_{xy}$$ of Fe$$_{4}$$N and Fe$$_{3.1}$$Co$$_{0.9}$$N, and large $$alpha_{xy}$$ leading to large S$$_{ANE}$$ was predicted in Fe$$_{3.1}$$Co$$_{0.9}$$N.

発表言語

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English

掲載資料名

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Journal of Magnetism and Magnetic Materials

巻

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628

号

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ページ数

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p.173157_1 - 173157_8

発行年月

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2025/09

発表会議名

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開催年月

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開催都市

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開催国

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キーワード

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anomalous Nernst effect; ferromagnetic nitrides

特許データ

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PDF

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論文URL

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https://doi.org/10.1016/j.jmmm.2025.173157

研究データの公開先DOI

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本成果にかかわる研究データのリンクです。

使用施設

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広報プレスリリース

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論文解説記事
(成果普及情報誌)

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受委託・共同研究相手機関

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東北大学

Access

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- Accesses

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