Volume 81, Number 6, March 2008
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||27 February 2008|
Spintronics with NSN junction of one-dimensional quantum wires: A study of pure spin current and magnetoresistance
Department of Condensed Matter Physics, Weizmann Institute of Science - Rehovot 76 100, Israel
2 Harish-Chandra Research Institute - Chhatnag Road, Jhusi, Allahabad 211 019, India
Accepted: 30 January 2008
We demonstrate possible scenarios for production of pure spin current and large tunnelling magnetoresistance ratios from elastic co-tunnelling and crossed Andreev reflection across a superconducting junction comprising of normal-metalsuperconductornormal-metal, where, the normal metal is a one-dimensional interacting quantum wire. We show that there are fixed points in the theory which correspond to the case of pure spin current. We analyze the influence of electron-electron interaction and see how it stabilizes or de-stabilizes the production of pure spin current. These fixed points can be of direct experimental relevance for spintronics application of normal-metalsuperconductornormal-metal junctions of one-dimensional quantum wires. We also calculate the power law temperature dependence of the crossed Andreev reflection enhanced tunnelling magnetoresistance ratio for the normal-metalsuperconductornormal-metal junction.
PACS: 73.23.-b – Electronic transport in mesoscopic systems / 74.45.+c – Proximity effects; Andreev effect; SN and SNS junctions / 72.25.Ba – Spin polarized transport in metals
© EPLA, 2008
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