Accession Number:

ADP012312

Title:

A Landau-Ginzburg Description of Sb Overlayers

Descriptive Note:

Conference proceedings

Corporate Author:

NEBRASKA UNIV LINCOLN DEPT OF PHYSICS AND ASTRONOMY

Report Date:

2001-04-01

Pagination or Media Count:

6.0

Abstract:

The spin polarization of Sb overlayers on the semi-Heusler alloy NiMnSb is investigated in terms of the Landau-Ginzburg approach. The half-metallic semi-Heusler alloy NiMnSb acts as a ferromagnetic perturbation and induces a spin polarization in the semimetallic Sb overlayer. Using a Gaussian approximation, the propagation of the spin perturbation in the overlayer is calculated. The results are compared with spin-polarized inverse photoemission spectroscopy SPIPES results and with recent spin-dependent envelope-function approximation SDEFA predictions. The Landau-Ginzburg parameters are both band-structure and temperature dependent, and it is argued that thermal spin excitations lead to an injection depth decreasing as 1T law at high temperatures.

Subject Categories:

  • Properties of Metals and Alloys
  • Electricity and Magnetism
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE