Direction inversion of spin-polarization current and exceptional tunnel magnetoresistance

By the rate equation method in sequential and cotunneling regimes, we study the transport current and tunnel magnetoresistance through a single molecule magnet asymmetrically coupled to two collinear ferromagnetic electrodes. It is observed that the direction of spin-polarization current can be inve...

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Bibliographic Details
Published inAIP advances Vol. 10; no. 12; pp. 125002 - 125002-7
Main Authors Xue, NaiTao, Guo, Yajing, Wang, Qiang, Wang, ZhiMei, Bai, XueMin
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 01.12.2020
AIP Publishing LLC
Subjects
Ferromagnetism
Magnetoresistivity
Polarization (spin alignment)
Spin valves
Spintronics
Tunnel magnetoresistance
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Summary:By the rate equation method in sequential and cotunneling regimes, we study the transport current and tunnel magnetoresistance through a single molecule magnet asymmetrically coupled to two collinear ferromagnetic electrodes. It is observed that the direction of spin-polarization current can be inversed by spin bias voltage and the adjacent magnetic field changed with left lead’s polarization. As a consequence, the tunnel magnetoresistance can reach exceptional values beyond the usual restriction of −1 to +1. Moreover, since charge current can be zero in parallel configuration and spin current stays positive, the pure spin current appears. Thus, the system may act as a spin-valve device.
ISSN:2158-3226
2158-3226
DOI:10.1063/5.0023245