Spin current through a tunnel junction |
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| Institution: | 1. ElMindA Ltd., Herzliya, Israel;2. University of California, Los Angeles School of Medicine, Los Angeles, CA, USA;3. Helen Wills Neuroscience Institute, University of California, Berkeley, CA, USA;4. Department of Psychology, University of California, Berkeley, CA, USA;5. Departments of Neurology, Physiology and Psychiatry, University of California San Francisco, San Francisco, CA, USA;6. Electrical and Computer Engineering, Ben Gurion University of the Negev, Beer Sheba, Israel |
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| Abstract: | We derive an expression for the spin current through a tunnel barrier in terms of many-body Green’s functions. The spin current has two possible contributions. One is associated with angular momentum transfer due to spin-polarized charge current crossing the junction. If there are magnetic moments on both sides of the tunnel junction, due to spin accumulation or ferromagnetic ordering, then there is a second contribution related to the exchange coupling between the moments. |
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