Accession Number:

ADA513021

Title:

Determining Exchange Splitting in a Magnetic Semiconductor by Spin-Filter Tunneling

Descriptive Note:

Corporate Author:

CALIFORNIA UNIV BERKELEY LAWRENCE BERKELEY LAB

Report Date:

2008-11-20

Pagination or Media Count:

12.0

Abstract:

A large exchange splitting of the conduction band in ultrathin films of the ferromagnetic semiconductor EuO was determined quantitatively, by using EuO as a tunnel barrier and fitting the current-voltage characteristics and temperature dependence to tunneling theory. This exchange splitting leads to different tunnel barrier heights for spin-up and spin-down electrons, and is large enough to produce a near fully spin-polarized current. Moreover, the magnetic properties of these ultrathin films 6 nm show a reduction in Curie temperature with decreasing thickness, in agreement with theoretical calculation.

Subject Categories:

  • Electrical and Electronic Equipment
  • Properties of Metals and Alloys
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE