“School of Nano-Sciences”
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| Paper IPM / Nano-Sciences / 11685 |
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| Abstract: | |||||
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The spin-dependent electrical conductance and magnetoresistance (MR) of a one-dimensional
system are calculated with disorder paramagnetic impurities. The system contains a quasi-paramagnetic
quantum wire (QPQW) device attached between two non-magnetic semi-infinite leads. The calculations
are based on the tight-binding model and generalized Greenâs function method within the phase coher-
ent transport regime. In order to investigate spin-filtering effect of QPQW, we study the spin-polarized
electrical transmission as a function of impurity concentration and molecular field acting on paramagnetic
impurities. It is assumed that in the absence of the external field, magnetic moments of the impurities are
compensated (oriented at random), whereas the magnetic field creates finite net magnetization. It is found
that the spin-dependent transport and MR depend strongly on the concentration of magnetic disorder,
the size of the system and the Fermi energy. It is shown that MR has an oscillating behavior with respect
to the magnetic molecular field at a fixed disorder concentration. The application of the predicted results
can be a base for the designing of spintronics and moletronics devices.
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