Possible contribution of high-energy magnons to unidirectional magnetoresistance in metallic bilayers

Kab Jin Kim, Tian Li, Sanghoon Kim, Takahiro Moriyama, Tomohiro Koyama, Daichi Chiba, Kyoung Jin Lee, Hyun Woo Lee, Teruo Ono

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We investigate temperature, temporal and magnetic-field dependence of unidirectional magnetoresistance (UMR) in metallic bilayers. The UMR is found to decrease rapidly with reducing temperature and converges to a finite value at low-temperature limit. The temporal dependence shows that the UMR emerges in a nanosecond time scale, which depends on the current amplitude. The magnetic-field dependence shows that the UMR is almost constant up to 5 T. These experimental results imply that the high-energy magnons, which are not considered in existing theory, can be involved in the observed UMR. Our results therefore suggest that a more extended theory is required for the complete understanding of UMR.

Original languageEnglish
Article number063001
JournalApplied Physics Express
Issue number6
Publication statusPublished - 2019 Jan 1


ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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