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Zeeman splitting in ferromagnetic Schottky barrier contacts based on doped EuS

Appl. Phys. Lett. 86, 012501 (2005); doi:10.1063/1.1842857

Published 23 December 2004

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Cong Ren, Jelena Trbovic, Peng Xiong, and Stephan von Molnár
MARTECH and Physics Department, Florida State University, Tallahassee, Florida 32306
Schottky barrier contacts of nonstoichiometric EuS, a ferromagnetic semiconductor, have been fabricated on Si (100) substrate and the current–voltage (I–V) characteristics are investigated at temperatures 150–5.0  K. The electrical transport across such Schottky contacts is found to be dominated by thermionic emission at high temperatures, while at low temperatures and low biases, electron tunneling is dominant. The lower bound estimate of the Schottky barrier heights was obtained by analyzing the high-bias current–voltage characteristics. A decrease in barrier height of 0.26±0.06  eV was deduced from the I–V characteristics as the temperature decreases below the ferromagnetic ordering temperature (TC) of the EuS. The variation of the barrier height below TC is the result of a spontaneous Zeeman splitting of the conduction band, and its temperature dependence resembles that of the spontaneous moment in EuS. The results point to the plausibility of using doped EuS as a spin injector and detector. ©2005 American Institute of Physics
History: Received 23 July 2004; accepted 28 October 2004; published 23 December 2004
Permalink: http://link.aip.org/link/?APPLAB/86/012501/1
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KEYWORDS and PACS

Keywords
PACS
  • 75.50.Pp
    Magnetic semiconductors
  • 75.50.Dd
    Nonmetallic ferromagnetic materials
  • 73.30.+y
    Surface double layers, Schottky barriers, and work functions
  • 71.70.Ej
    Spin–orbit coupling, Zeeman and Stark splitting, Jahn–Teller effect (condensed matter)
  • 75.70.Cn
    Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
  • 73.40.Ns
    Electrical properties of metal–nonmetal contacts
  • 73.20.At
    Surface states, band structure, electron density of states
  • 75.60.Ej
    Magnetization curves, hysteresis, Barkhausen and related effects
  • 75.30.Cr
    Saturation moments and magnetic susceptibilities in magnetically ordered materials
  • 75.40.Cx
    Static properties of magnetic materials including order parameter, static susceptibility, heat capacities, critical exponents, etc
  • YEAR: 2005

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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