Room temperature ferromagnetism of Ge/MnAs digital alloys

J. J. Lee, M. Y. Kim, Y. Cui, J. H. Song, A. 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 - Dec 1 2005

Keywords

  • Carie temperature
  • Ferromagnetism
  • Ge/MnAs digital alloys

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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