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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.

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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