Spin-mediated charge-to-heat current conversion phenomena in ferromagnetic binary alloys

Asuka Miura, Ryo Iguchi, Takeshi Seki, Koki Takanashi, Ken Ichi Uchida

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Spin-mediated charge-to-heat current conversion phenomena, i.e., the anomalous Ettingshausen effect (AEE) and the anisotropic magneto-Peltier effect (AMPE), have been investigated in various ferromagnetic Ni-Fe, Ni-Pt, Ni-Pd, and Fe-Pt binary alloys at room temperature. When a charge current is applied to a ferromagnetic conductor, the AMPE modulates the Peltier coefficient depending on the angle between the directions of the charge current and magnetization, while the AEE generates a heat current in the direction perpendicular to both the charge current and magnetization. We observed the strong material dependence of the thermoelectric conversion coefficients and figures of merit of these phenomena. Among the ferromagnetic alloys used in this study, Ni95Pt5 exhibits the largest AMPE of which the anisotropy of the Peltier coefficient is ∼12%. In contrast, the magnitude of the AEE signals is moderate in Ni95Pt5 but largest in Ni75Pt25 and Ni50Fe50. We discuss these behaviors by exploring the relations between these charge-to-heat current conversion phenomena and other transport as well as magnetic properties. This systematic study will provide a clue for clarifying the mechanisms of the AMPE and AEE and for enhancing the thermoelectric conversion efficiency of these phenomena.

Original languageEnglish
Article number034409
JournalPhysical Review Materials
Volume4
Issue number3
DOIs
Publication statusPublished - 2020 Mar

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

Fingerprint Dive into the research topics of 'Spin-mediated charge-to-heat current conversion phenomena in ferromagnetic binary alloys'. Together they form a unique fingerprint.

Cite this