Noncollinear Spin Torque Effect in Magnetic Heterojunctions: Combined First-Principles Calculation and TB-NEGF Method

ORAL

Abstract

In this study, our newly developed “JunPy” [1] package has successfully combined the self-consistent Hamiltonian by using the first-principles calculation [2], including multi-band dispersion relation and complicated interfacial coupling, with the TB model and the non-equilibrium Green’s function (NEGF) method to investigate the noncollinear magnetotransport properties in nm-scale magnetic heterojunctions. This program is first testified by the spin-polarized currents and the noncollinear spin torque effect in conventional Fe/MgO/Fe MTJ. We further employed it to predictthe giant field-like spin torque (FLST) effect in the amine-ended single-molecule magnetic junction [3], which may open a new avenue formultifunctional manipulation in next-generation organicFLST-MRAMs with lower power consumption.

[1] JunPy package: https://labstt.phy.ncu.edu.tw/junpy
[2] Nanodcal package: http://nanoacademic.ca/showArticle.jsp?id=17
[3] Y. –H. Tang and B. –H. Huang, J. Phys. Chem. C 122, 20500 (2018).

*This work is supported by the Ministry of Science and Technology (MOST 106-2112-M-008-011- and 106-2633-M-008-002-) and the National Center for Theoretical Sciences, Republic of China.

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Presenters

  • Bao-Huei Huang

    • Department of Physics, National Central University

Authors

  • Bao-Huei Huang

    • Department of Physics, National Central University

  • Chia-Chia Chao

    • Department of Physics, National Central University

  • Yu-Hui Tang

    • Department of Physics, National Central University

  • Chao-Cheng Kaun

    • Academia Sinica, Research Center for Applied Sciences