The influence of the Dresselhaus spin-orbit coupling on the tunneling magnetoresistance in ferromagnet/semiconductor/ferromagnet tunnel junctions

Wang Xiaohua; An Xingtao; Liu Jianjun

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The influence of the Dresselhaus spin-orbit coupling on the tunneling magnetoresistance in ferromagnet/semiconductor/ferromagnet tunnel junctions

Wang Xiaohua,An Xingtao,Liu Jianjun * #

College of Physical Science and Information Engineering, Hebei Normal University

*Correspondence author

#Submitted by

Subject:

Funding: 国家自然科学基金,教育部博士点基金（No.10674040,20060094002）

Opened online:17 June 2008

Accepted by: none

Citation: Wang Xiaohua,An Xingtao,Liu Jianjun.The influence of the Dresselhaus spin-orbit coupling on the tunneling magnetoresistance in ferromagnet/semiconductor/ferromagnet tunnel junctions[OL]. [17 June 2008] http://en.paper.edu.cn/en_releasepaper/content/22301

We investigate the effect of Dresselhaus spin-orbit coupling (SOC) on the spin-transport properties of the ferromagnet (FM)/semiconductor (SM)/ferromagnet (FM) double-barrier structures. Due to the thin oxide layers at the interfaces between the FM and the SM, caused by experimental preparation technique, the thickness of the insulator (IN) between the FM and the SM should be considered theoretically. Using a transfer-matrix method, we calculate the transmission, polarization and tunneling magnetoresistance (TMR) of the structure. Our results indicate that (i) the polarization can be enhanced by reducing the IN layers at zero temperature and (ii) the TMR inversion observed experimentally can be illustrated by the influence of the Dresselhaus SOC effect. The theoretical results explain qualitatively the polarization and the TMR characteristics revealed in the experiment. Taking into account the Dresselhaus SOC effect, the TMR inversion occurs when the energy of a localized state in the barrier matches the Fermi energy of the ferromagnetic electrodes.

Keywords:Dresselhaus spin-orbit coupling; tunneling magnetoresistance; ferromagnet/semiconductor/ferromagnet tunnel junctions

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