Spin Dependent 2d Electron Scattering by Nanomagnets
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Date
2012-02
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Addis Ababa University
Abstract
The fundamental concept of spintronics,the di erence between nanoparticle and the corresponding
bulk material is presented. Mathematical expression of scattering amplitude
is derived for 3D and 2D scattering of electron from small target particle. But emphasis
is given for 2D scattering problem of an electron by a magnetized nanoparticle using Born
approximation with account of the dipole- dipole interaction of the magnetic moments of
electron and nanomagnet. Born approximation doesn't work for nanomagnet gigantic
,for slow particles. We can justify it only for fast particle.
The scattering amplitudes in this problem are the two-component spinors. They are
obtained as functions of the electron spin orientation, the electron energy and show
anisotropy in scattering angle. The initially polarized beam of electrons scattered by
the nanomagnet consists of electrons with no spin
ipped and spin
ipped. The majority
of electrons with no spin
ipped are scattered by small angles. The majority electrons
with spin
ipped are scattered in the vicinity of the scattering angles
2 and 3
2 .This can
be used as one more as one more method of controlling the spin current.
The scattering amplitudes depend on mutual orientation of the magnetic moment of the
nanomagnet and the electron,the energy of electron and the scattering angle
Description
Keywords
Spin Dependent 2d Electron