Observation of magnon-mediated current drag in Pt/yttrium iron garnet/Pt(Ta) trilayers

Junxue Li, Yadong Xu, Mohammed Aldosary, Chi Tang, Zhisheng Lin, Shufeng Zhang, Roger Lake and Jing Shi ()
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Junxue Li: University of California
Yadong Xu: University of California
Mohammed Aldosary: University of California
Chi Tang: University of California
Zhisheng Lin: University of California
Shufeng Zhang: University of Arizona
Roger Lake: University of California
Jing Shi: University of California

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract Pure spin current, a flow of spin angular momentum without flow of any accompanying net charge, is generated in two common ways. One makes use of the spin Hall effect in normal metals (NM) with strong spin–orbit coupling, such as Pt or Ta. The other utilizes the collective motion of magnetic moments or spin waves with the quasi-particle excitations called magnons. A popular material for the latter is yttrium iron garnet, a magnetic insulator (MI). Here we demonstrate in NM/MI/NM trilayers that these two types of spin currents are interconvertible across the interfaces, predicated as the magnon-mediated current drag phenomenon. The transmitted signal scales linearly with the driving current without a threshold and follows the power-law Tn with n ranging from 1.5 to 2.5. Our results indicate that the NM/MI/NM trilayer structure can serve as a scalable pure spin current valve device which is an essential ingredient in spintronics.

Date: 2016
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DOI: 10.1038/ncomms10858

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