Electric and thermo spin transfer torques in Fe/Vacuum/Fe tunnel junction |
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| Authors: | Xing-Tao Jia Ke Xia |
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| Institution: | 1. Department of Physics, Beijing Normal University, Beijing 100875, China2. Department of Physics and Chemistry, Henan Polytechnic University, Jiaozuo 454000, China |
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| Abstract: | We present first-principle calculations of electric and thermo spin transfer torques (STT) in Fe/Vacuum(Vac)/Fe magnetic tunnel junctions (MTJs). Our quantitative studies demonstrate rich bias dependence of STT and tunnel magneto resistance (TMR) behaviors with respect to the interface roughness. Thermoelectric effects in Fe/Vac/Fe MTJs is remarkable. We observe larger ZT of 6.2 in 8 ML clean Vacuum barrier, where the heavily restrained thermal conductance should be responsible for. Thermo-STT in Fe/Vac/Fe MTJs show same order as that in Fe/MgO/Fe MTJs with similar barrier thickness. |
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| Keywords: | thermoelectric effect spin transfer torque Fe/Vacuum/Fe tunnel junction |
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