2D Spin-Dependent Electron Scattering by Nanomagnets
No Thumbnail Available
Date
2012-02
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
The 2D scattering problem of an electron by a magnetized nanoparticle is solved in the
Born approximation with account of the dipole - dipole interaction of the magnetic
moments of electron and nanomagnet. 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 nanomagnet consists of electrons with no spin
flipped and spin flipped. The majority of electrons with no spin flipped are scattered
by small angles. This can be used as one method of controlling spin currents.
2D spin-dependent scattering of slow unpolarized beams of electrons by charged
nanomagnets is analyzed in the Born approximation. The obtained scattering lengths
are larger than those from the neutral nanomagnets approximately by one order.
It is shown that for particular parameters of the system it is possible to polarize
completely the scattered electrons in a narrow range of scattering angles. The most
suitable system for realization of these effects is 2D Si electron gas with immersed
nanomagnets.
The 2D spin-dependent electron scattering by the linear chain of periodic nanomagnets
with account of the diffraction effects was studied. This effect takes place
in 2D electron gas with immersed nanomagnets. By tuning a distance between nanomagnets,
it is possible to obtain diffraction maximum of the scattered electrons at
scattering angle, which corresponds to complete spin polarization of electrons. The
total diffraction scattering lengths are proportional to N2 (N is a number of nanomagnets).
The proposed system can be an efficient separator of spin polarized currents
Description
Keywords
Electron Scattering by Nanomagnets