A Landau-Ginzburg Description of Sb Overlayers

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 1//T law at high temperatures.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 2001
Accession Number
ADP012312

Entities

People

  • C. N. Borca
  • H. K. Jeong
  • P. A. Dowben
  • R. Skomski
  • T. Komesu

Organizations

  • University of Nebraska–Lincoln

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Band Gaps
  • Band Structures
  • Boundaries
  • Electron Density
  • Electron Gas
  • Electrons
  • Energy
  • Energy Bands
  • Energy Gaps
  • Fermi Levels
  • Fermi Surfaces
  • Films
  • Free Electrons
  • Materials
  • Semiconductors
  • Spintronics
  • Thin Films

Fields of Study

  • Physics

Readers

  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.
  • Thin Film Deposition Science.