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We report the effect of Ir doping on the anomalous Hall effect (AHE) and anomalous Nernst effect (ANE) in Fe3Co single-crystal thin films. (Fe3Co)100–xIrx (x ≤ 12%) composition-spread thin films are fabricated on MgO(100) substrates by a combinatorial sputtering technique for a high-throughput and systematic characterization. From a structural analysis using X-ray diffraction, the films are grown epitaxially on the substrates and B2-ordered phase is detected from x = 7.3% to 12%. The compositional dependence of the AHE, magnetoresistance, ANE, and Seebeck effect is measured to obtain anomalous Hall resistivity (ρ_yx^A), longitudinal resistivity (ρ_xx), anomalous Nernst coefficient (S_ANE), and Seebeck coefficient (S_SE), respectively. From these transport measurements, we calculate anomalous Nernst conductivity (α_xy^A). A large enhancement of the ρ_yx^A value is observed upon Ir doping by a factor of ≈ 9.2 for x = 12% at 300 K. By employing a scaling analysis to the AHE results, extrinsic contribution is found to be increased after Ir doping in the low-Ir concentration regime, while intrinsic contribution becomes more dominant in the high-Ir concentration regime. On the other hand, unlike the ρ_yx^A, the S_ANE does not show significant compositional dependence. We find that AHE-related contribution is dominant to the S_ANE compared to the contribution from direct conversion of a temperature gradient to a transverse charge current by anomalous Nernst conductivity. We also find that the α_xy^A value sharply changes from a positive to negative value immediately after Ir doping, showing a negative maximum at x ≈ 1%, followed by a decrease in magnitude to almost zero for x = 12%. Based on the Mott’s relation and the scaling analysis of the AHE, we suggest a possible connection between the α_xy^A and the extrinsic contribution of the AHE. These experimental results and analysis will provide insights into the relationship between the AHE and ANE in ferromagnetic alloys upon heavy metal doping.

権利情報:

• In Copyright
  ©2024 American Physical Society

キーワード: anomalous Hall effect, anomalous Nernst effect, Seebeck effect, spin-orbit coupling

刊行年月日: 2024-02-12

出版者: American Physical Society (APS)

掲載誌:

• Physical Review B (ISSN: 24699969) vol. 109 issue. 5 054415

研究助成金:

• Japan Science and Technology Corporation JPMJCR21O1
• Japan Science and Technology Corporation JPMJER2201
• Ministry of Education, Culture, Sports, Science and Technology JPMXP1122715503
• Japan Society for the Promotion of Science JP21H01608
• Japan Society for the Promotion of Science JP22K20494

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4715

公開URL: https://doi.org/10.1103/physrevb.109.054415

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更新時刻: 2024-08-31 08:31:07 +0900

MDRでの公開時刻: 2024-08-31 08:31:07 +0900