Room temperature ferromagnetism of Ge/MnAs digital alloys

J. J. Lee, M. Y. Kim, Y. Cui, J. H. Song, Arthur J Freeman, J. B. Ketterson

Research output: Contribution to journalArticle

Abstract

The magnetic properties of Ge/MnAs digital alloys on GaAs (001) substrates, grown by molecular beam epitaxy, were investigated using a Quantum Design SQUID magnetometer. The Ge (1 nm)/MnAs (0.15 nm) digital alloy showed ferromagnetism up to 334 K with a coercive field of 576 Oe at room temperature, as determined from temperature-dependent magnetization and hysteresis loop measurements. The ferromagnetic and antiferromagnetic phases of a Ge7/(Mn 0.5As0.5)1 superlattice, investigated using the full-potential linearized augmented plane wave (FLAPW) method yielded a ferromagnetic ground state with a high spin magnetic moment of Mn (3.45 μB) which induces only very small magnetic moments on its neighboring As or Ge atoms.

Original languageEnglish
Pages (from-to)75-78
Number of pages4
JournalJournal of Superconductivity and Novel Magnetism
Volume18
Issue number1
DOIs
Publication statusPublished - 2005

Fingerprint

Ferromagnetism
Magnetic moments
ferromagnetism
magnetic moments
SQUIDs
room temperature
Magnetometers
Hysteresis loops
Molecular beam epitaxy
magnetometers
Ground state
Magnetization
Magnetic properties
plane waves
molecular beam epitaxy
hysteresis
magnetic properties
Atoms
Temperature
magnetization

Keywords

  • Carie temperature
  • Ferromagnetism
  • Ge/MnAs digital alloys

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Room temperature ferromagnetism of Ge/MnAs digital alloys. / Lee, J. J.; Kim, M. Y.; Cui, Y.; Song, J. H.; Freeman, Arthur J; Ketterson, J. B.

In: Journal of Superconductivity and Novel Magnetism, Vol. 18, No. 1, 2005, p. 75-78.

Research output: Contribution to journalArticle

Lee, J. J. ; Kim, M. Y. ; Cui, Y. ; Song, J. H. ; Freeman, Arthur J ; Ketterson, J. B. / Room temperature ferromagnetism of Ge/MnAs digital alloys. In: Journal of Superconductivity and Novel Magnetism. 2005 ; Vol. 18, No. 1. pp. 75-78.
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