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

doi:10.7567/1882-0786/ab1b54

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

Department of Materials Science and Engineering

Research output: Contribution to journal › Article

Abstract

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 language	English
Article number	063001
Journal	Applied Physics Express
Volume	12
Issue number	6
DOIs	https://doi.org/10.7567/1882-0786/ab1b54
Publication status	Published - 2019 Jan 1

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

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Kim, K. J., Li, T., Kim, S., Moriyama, T., Koyama, T., Chiba, D., Lee, K. J., Lee, H. W., & Ono, T. (2019). Possible contribution of high-energy magnons to unidirectional magnetoresistance in metallic bilayers. Applied Physics Express, 12(6), [063001]. https://doi.org/10.7567/1882-0786/ab1b54

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abstract = "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.",

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AU - Kim, Kab Jin

AU - Li, Tian

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AU - Moriyama, Takahiro

AU - Koyama, Tomohiro

AU - Chiba, Daichi

AU - Lee, Kyoung Jin

AU - Lee, Hyun Woo

AU - Ono, Teruo

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AB - 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.

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