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

Physical Review Letters
Simranjeet SinghRoland K Kawakami

Abstract

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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Citations

May 24, 2017·Nano Letters·Yunqiu Kelly LuoRoland K Kawakami
Nov 27, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Kunhua ZhangQiang Cheng
Aug 25, 2018·Physical Review Letters·C CardosoJ Fernández-Rossier
Oct 9, 2018·Physical Review Letters·Jinsong XuRoland K Kawakami
Feb 20, 2021·Physical Review Letters·Tobias M R WolfJose L Lado
May 8, 2021·Nature Nanotechnology·Talieh S GhiasiBart J van Wees
Apr 18, 2020·Nano-micro Letters·Yanping LiuZongwen Liu
Jul 21, 2021·Nature Nanotechnology·Juan F SierraSergio O Valenzuela
May 29, 2018·ACS Applied Materials & Interfaces·Dmitry V AveryanovVyacheslav G Storchak
Feb 27, 2018·Nano Letters·Kenan SongStephan Roche
Aug 7, 2018·ACS Applied Materials & Interfaces·Teerayut UwannoKosuke Nagashio

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