Possible contribution of high-energy magnons to unidirectional magnetoresistance in metallic bilayers
Possible contribution of high-energy magnons to unidirectional magnetoresistance in metallic bilayers
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DOI：
10.7567/1882-0786/ab1b54
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发表时间：
2019-05
影响因子：
2.3
通讯作者：
Kab-Jin Kim;Tian Li;Sanghoon Kim;T. Moriyama;T. Koyama;D. Chiba;Kyung-Jin Lee;Hyun-Woo Lee;T. Ono
中科院分区：
文献类型：
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作者：
Kab-Jin Kim;Tian Li;Sanghoon Kim;T. Moriyama;T. Koyama;D. Chiba;Kyung-Jin Lee;Hyun-Woo Lee;T. Ono
研究了金属双层膜中单向磁电阻效应的温度、时间和磁场依赖性。发现UMR随温度的降低而迅速减小，并在低温极限下收敛到一个有限值。时间依赖性表明，UMR出现在纳秒的时间尺度，这取决于电流的幅度。磁场的依赖性表明，UMR几乎是恒定的高达5 T。这些实验结果表明，高能磁振子，这是在现有的理论中没有考虑，可以参与观察到的UMR。因此，我们的研究结果表明，一个更广泛的理论是需要完整的理解UMR。
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.