Transport through a single discrete level for non-collinear magnetic polarizations of the electron reservoirs |
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| Affiliation: | 1. Department of Physics, Adam Mickiewicz University, ul. Umultowska 85, 61-614 Poznań, Poland;2. Faculty of Physics, Warsaw University of Technology, ul. Koszykowa 75, 00-662 Warszawa, Poland;3. Institute of Molecular Physics, Polish Academy of Sciences, ul. Smoluchowskiego 17, 60-179 Poznań, Poland;1. Key Laboratory of Advanced Display Materials and Devices, Ministry of Industry and Information Technology, College of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;2. Materials Department, University of California, Santa Barbara, CA 93106, USA;1. Department of Physics, North Eastern Hill University, Shillong, Meghalaya 793022, India;2. Department of Physics, Indian Institute of Technology Guwahati, Assam 781039, India;1. Thick and Thin Film Device Laboratory, Department of Physics, Shivaji University, Kolhapur- 416004, Maharashtra, India;2. Department of Materials Science and Engineering, Yonsei University, Seoul 03722, South Korea |
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| Abstract: | Spin-polarized transport through a non-interacting single-level quantum dot coupled to two ferromagnetic leads with non-collinear magnetizations is analyzed theoretically by the non-equilibrium Green function technique. It is shown that spin of an electron that has tunnelled on the dot precesses around an effective exchange field before it leaves the dot. The exchange field originates from interaction between the electron and external electrodes. Electric current, tunnel magnetoresistance, and average value of spin accumulated on the dot are calculated for an arbitrary angle between magnetic moments of the electrodes. |
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