【摘 要】
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Spin polarization in ferromagnetic metal/insulator/spin-filter barrier/nonmagnetic metal,referred to as quasimagnetic tunnel junctions,is studied within the fre
【机 构】
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College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610066
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Spin polarization in ferromagnetic metal/insulator/spin-filter barrier/nonmagnetic metal,referred to as quasimagnetic tunnel junctions,is studied within the free-electron model.Our results show that large positive or negative spin-polarization can be obtained at high bias in quasi-magnetic tunnel junctions,and within large bias variation regions,the degree of spin-polarization can be linearly tuned by bias.These linear variation regions of spin-polarization with bias are influenced by the barrier thicknesses,barrier heights and molecular fields in the spin-filter (SF) layer.Among them,the variations of thickness and heights of the insulating and SF barrier layers have influence on the value of spin-polarization and the linear variation regions of spin-polarization with bias.However,the variations of moIecular field in the SF layer only have influence on the values of the spin-polarization and the influences on the linear variation regions of spin-polarization with bias are slight.
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