Voltage Control of a van der Waals Spin-Filter Magnetic Tunnel Junction

Song, Tiancheng; Tu, Matisse Wei-Yuan; Carnahan, Caitlin; Cai, Xinghan; Taniguchi, Takashi; Watanabe, Kenji; McGuire, Michael A.; Cobden, David H.; Xiao, Di; Yao, Wang; Xu, Xiaodong

doi:10.1021/acs.nanolett.8b04160

Voltage Control of a van der Waals Spin-Filter Magnetic Tunnel Junction

Journal Article · Tue Jan 08 00:00:00 EST 2019 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.8b04160· OSTI ID:1503984

^[1]; ^[2]; Carnahan, Caitlin ^[3]; Cai, Xinghan ^[1]; Taniguchi, Takashi ^[4]; ^[4]; ^[5]; Cobden, David H. ^[1]; Xiao, Di ^[3]; Yao, Wang ^[2]; Xu, Xiaodong ^[1]

Univ. of Washington, Seattle, WA (United States)
Univ. of Hong Kong, Hong Kong (China)
Carnegie Mellon Univ., Pittsburgh, PA (United States)
National Inst. for Materials Science (NIMS), Tsukuba (Japan)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Atomically thin chromium triiodide (CrI₃) has recently been identified as a layered antiferromagnetic insulator, in which adjacent ferromagnetic monolayers are antiferromagnetically coupled. This unusual magnetic structure naturally comprises a series of antialigned spin filters, which can be utilized to make spin-filter magnetic tunnel junctions with very large tunneling magnetoresistance (TMR). Here we report voltage control of TMR formed by four-layer CrI₃ sandwiched by monolayer graphene contacts in a dual-gated structure. By varying the gate voltages at fixed magnetic field, the device can be switched reversibly between bistable magnetic states with the same net magnetization but drastically different resistance (by a factor of 10 or more). Also, without switching the state, the TMR can be continuously modulated between 17,000% and 57,000%, due to the combination of spin-dependent tunnel barrier with changing carrier distributions in the graphene contacts. Our work shows new kinds of magnetically moderated transistor action and opens up possibilities for voltage-controlled van der Waals spintronic devices.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1503984

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 2 Vol. 19; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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