Strong Modulation of Spin Currents in Bilayer Graphene by Static and Fluctuating Proximity Exchange Fields

Singh, Simranjeet; Katoch, Jyoti; Zhu, Tiancong; Meng, Keng-Yuan; Liu, Tianyu; Brangham, Jack T.; Yang, Fengyuan; Flatté, Michael E.; Kawakami, Roland K.

doi:10.1103/physrevlett.118.187201

Title: Strong Modulation of Spin Currents in Bilayer Graphene by Static and Fluctuating Proximity Exchange Fields

Journal Article · Tue May 02 00:00:00 EDT 2017 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.118.187201· OSTI ID:1536502

Singh, Simranjeet ^[1]; Katoch, Jyoti ^[1]; Zhu, Tiancong ^[1]; Meng, Keng-Yuan ^[1]; Liu, Tianyu ^[2]; Brangham, Jack T. ^[1]; Yang, Fengyuan ^[1]; Flatté, Michael E. ^[2]; Kawakami, Roland K. ^[1]

The Ohio State Univ., Columbus, OH (United States). Dept. of Physics
Univ. of Iowa, Iowa City, IA (United States). Optical Science and Technology Center. Dept. of Physics and Astronomy

Two-dimensional materials provide a unique platform to explore the full potential of magnetic proximity-driven phenomena, which can be further used for applications in next-generation spintronic devices. Of particular interest is to understand and control spin currents in graphene by the magnetic exchange field of a nearby ferromagnetic material in graphene–ferromagnetic-insulator (FMI) heterostructures. Here, we present the experimental study showing the strong modulation of spin currents in graphene layers by controlling the direction of the exchange field due to FMI magnetization. Owing to clean interfaces, a strong magnetic exchange coupling leads to the experimental observation of complete spin modulation at low externally applied magnetic fields in short graphene channels. Additionally, we discover that the graphene spin current can be fully dephased by randomly fluctuating exchange fields. This is manifested as an unusually strong temperature dependence of the nonlocal spin signals in graphene, which is due to spin relaxation by thermally induced transverse fluctuations of the FMI magnetization.

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Research Organization:: The Ohio State Univ., Columbus, OH (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0001304

OSTI ID:: 1536502

Alternate ID(s):: OSTI ID: 1355081

Journal Information:: Physical Review Letters, Vol. 118, Issue 18; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 58 works

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