Analysis for Spin Polarization of Electrons Scattered on the Surface of Magnetic Substance bys-dModel

Abstract

We discuss spin polarization of the electrons scattered on the surface of a magnetic substance on the basis of the s-d hamiltonian, provided that incident electrons have exchange interactions ( s-d interaction) with the spin existing on the surface of material. From the analysis about the spin polarization of scattered electron in paramagnetic materials, it is found that, though the difference in the number of electrons with ↑ or ↓ spin increases with external field, there seems to be little difference even when a large external field is applied. In ferromagnetic materials, scattering polarization asymmetry is found to be proportional to the magnetization in sufficiently close region to T c . In superparamagnetic materials, the difference in the number of electrons with ↑ or ↓ spin shows field dependence strongly owing to spin alignment in a cluster.