Temperature dependence of shot noise in double barrier magnetic tunnel junctions

ORAL

Abstract

Shot noise reveals spin dependent transport properties in a magnetic tunnel junction. We report measurement of shot noise in CoFeB/MgO/CoFeB/MgO/CoFeB double barrier magnetic tunnel junctions, which shows a strong temperature dependence. The Fano factor used to characterize shot noise increases with decreasing temperature. A sequential tunneling model can be used to account for these results, in which a larger Fano factor results from larger spin relaxation length at lower temperatures.

*Work at Peking University was supported by National Natural Science Foundation of China (NSFC, Grant No. 11474008), and The National Key Research and Development Program of China No. 2016YFA0300904, as well as National Basic Research Program of China (973 Program) through Grants No. 2011CBA00106 and No. 2012CB927400. Work at IOP, CAS was supported by the NSFC, Grant No. 11434014. Work at Trinity College Dublin was supported by SFI Contract No. 10/IN1.13006. X.G.Z. acknowledges support in part by NSF Grant No. ECCS-1508898. J.F.F. acknowledges Youth Innovation Promotion Association of Chinese Academy of Sciences (Grant No. 2017010)

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Presenters

  • Jiasen Niu

    • International Center for Quantum Materials, Peking University
    • Leiden University

Authors

  • Jiasen Niu

    • International Center for Quantum Materials, Peking University
    • Leiden University

  • Liang Liu

    • Natl Univ of Singapore

  • Jiafeng Feng

    • Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences

  • Xiufeng Han

    • CAS
    • Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences

  • J M D Coey

    • Trinity College
    • CRANN and School of Physics, Trinity College

  • Xiaoguang Zhang

    • Department of Physics and the Quantum Theory Project, University of Florida
    • University of Florida
    • Department of Physics, Center for Molecular Magnetic Quantum Materials and Quantum Theory Project, University of Florida
    • Department of Physics, University of Florida
    • Department of Physics and the Quantum Theory Project, University of Florida, Gainesville, FL
    • Physics, University of Florida

  • Jian Wei

    • Peking University