Temperature dependence of shot noise in double barrier magnetic tunnel junctions

Jiasen Niu, Liang Liu, J. F. Feng, X. F. Han, J. M. D. Coey, X.-G. Zhang, and Jian Wei
Phys. Rev. B 97, 104412 – Published 20 March 2018
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  • INTRODUCTION
  • METHOD: HIGH FREQUENCY MEASUREMENT SETUP
  • RESULTS AND DISCUSSION
  • CONCLUSION
  • ACKNOWLEDGMENTS
  • APPENDICES
    • References

    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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    • Received 17 January 2018
    • Revised 28 February 2018

    DOI:https://doi.org/10.1103/PhysRevB.97.104412

    ©2018 American Physical Society

    Physics Subject Headings (PhySH)

    1. Research Areas
    Fluctuations & noiseMagnetism
    Condensed Matter, Materials & Applied Physics

    Authors & Affiliations

    Jiasen Niu1,*, Liang Liu1, J. F. Feng2,3, X. F. Han2,3, J. M. D. Coey4, X.-G. Zhang5, and Jian Wei1,6

    • 1International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
    • 2Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
    • 3University of Chinese Academy of Sciences, Beijing 100049, China
    • 4CRANN and School of Physics, Trinity College, Dublin 2, Ireland
    • 5Department of Physics and the Quantum Theory Project, University of Florida, Gainesville, Florida 32611, USA
    • 6Collaborative Innovation Center of Quantum Matter, Beijing 100871, China

    • *jiasenniu@pku.edu.cn

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    Issue

    Vol. 97, Iss. 10 — 1 March 2018

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