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Sm-Co bulk alloys are well known permanent magnets having large remanent magnetizations and coercive forces and are widely used in many industrial products. Recently, a large transverse thermoelectric conversion was observed for SmCo5 over a wide temperature range in the absence of magnetic fields. The large anomalous Nernst coefficient (ANC) was also confirmed by the first-principles density functional theory (DFT) calculations. In this study, we predicted further enhancement of the ANC by including Ni in Co site of SmCo5. We showed that the ANC of Sm(Co1-xNix)5 increases with increasing the Ni ratio and takes the maximum value αxy = 11.3 A K-1 m-1 around x = 0.08 at 300 K, which is about 77% enhancement of αxy = 6.4 A K-1 m-1 in SmCo5. We clarified that the band-proximity points near the nodal line of Sm(Co0.92Ni0.08)5 are the main contributing factor to the large Berry curvature, providing the steep slope of the energy dependence in the anomalous Hall conductivity around the Fermi energy.

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• In Copyright
  This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Yoshio Miura et al., Appl. Phys. Lett. 124, 212408 (2024) and may be found at https://doi.org/10.1063/5.0206878

Keyword: Density functional theory, First-principle calculations, Hall effect, Ferromagnetism, Magnetism, Electronic band structure, Superlattices, Thermoelectricity

Date published: 2024-05-20

Publisher: AIP Publishing

Journal:

• Applied Physics Letters (ISSN: 00036951) vol. 124 issue. 21

Funding:

• Exploratory Research for Advanced Technology JPMJER2201
• Core Research for Evolutional Science and Technology JPMJCR17I1
• Japan Society for the Promotion of Science JP22H04966
• Japan Society for the Promotion of Science JP22H04965

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4568

First published URL: https://doi.org/10.1063/5.0206878

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Updated at: 2024-07-13 08:30:19 +0900

Published on MDR: 2024-07-13 08:30:19 +0900