Spin-charge conversion in NiMnSb Heusler alloy films

Zhenchao Wen, Zhiyong Qiu, Sebastian Tölle, Cosimo Gorini, Takeshi Seki, Dazhi Hou, Takahide Kubota, Ulrich Eckern, Eiji Saitoh, Koki Takanashi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Half-metallic Heusler alloys are attracting considerable attention because of their unique half-metallic band structures, which exhibit high spin polarization and yield huge magnetoresistance ratios. Besides serving as ferromagnetic electrodes, Heusler alloys also have the potential to host spin-charge conversion. Here, we report on the spin-charge conversion effect in the prototypical Heusler alloy NiMnSb. An unusual charge signal was observed with a sign change at low temperature, which can be manipulated by film thickness and ordering structure. It is found that the spin-charge conversion has two contributions. First, the interfacial contribution causes a negative voltage signal, which is almost constant versus temperature. The second contribution is temperature dependent because it is dominated by minority states due to thermally excited magnons in the bulk part of the film. This work provides a pathway for the manipulation of spin-charge conversion in ferromagnetic metals by interface-bulk engineering for spintronic devices.

Original languageEnglish
Article numbereaaw9337
JournalScience Advances
Volume5
Issue number12
DOIs
Publication statusPublished - 2019 Dec 13

ASJC Scopus subject areas

  • General

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