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

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

doi:10.1103/PhysRevLett.118.187201

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

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

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

Physical review letters, Vol.118(18), pp.187201-187201

05/05/2017

DOI: 10.1103/PhysRevLett.118.187201

PMID: 28524685

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https://arxiv.org/pdf/1610.08017View

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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.

Details

Title: Subtitle: Strong Modulation of Spin Currents in Bilayer Graphene by Static and Fluctuating Proximity Exchange Fields
Creators: Simranjeet Singh - The Ohio State University
Jyoti Katoch - The Ohio State University
Tiancong Zhu - The Ohio State University
Keng-Yuan Meng - The Ohio State University
Tianyu Liu - University of Iowa
Jack T Brangham - The Ohio State University
Fengyuan Yang - The Ohio State University
Michael E Flatté - University of Iowa
Roland K Kawakami - The Ohio State University
Resource Type: Journal article
Publication Details: Physical review letters, Vol.118(18), pp.187201-187201
DOI: 10.1103/PhysRevLett.118.187201
PMID: 28524685
NLM abbreviation: Phys Rev Lett
ISSN: 0031-9007
eISSN: 1079-7114
Grant note: DOI: 10.13039/100000006, name: Office of Naval Research, award: N00014-14-1-0350; DOI: 10.13039/100000001, name: National Science Foundation, award: DMR-1310661, DMR-1507274, DMR-1420451; DOI: 10.13039/100000183, name: Army Research Office, award: W911NF-11-1-0182; DOI: 10.13039/100007245, name: Microelectronics Advanced Research Corporation; DOI: 10.13039/100000185, name: Defense Advanced Research Projects Agency; DOI: 10.13039/100000015, name: U.S. Department of Energy, award: DE-SC0001304; name: C-SPIN
Language: English
Date published: 05/05/2017
Academic Unit: Electrical and Computer Engineering; Physics and Astronomy
Record Identifier: 9984199836102771

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