Ferromagnetism of Mn/Ge multilayers grown by molecular beam epitaxy

J. J. Lee, J. E. Medvedeva, J. H. Song, Y. Cui, A. J. Freeman, J. B. Ketterson

Research output: Contribution to journalArticle

Abstract

We report on novel ferromagnetic Mn/Ge multilayers for spintronics applications investigated both experimentally and theoretically. Two Mn/Ge multilayers are grown on GaAs (001) substrates by molecular beam epitaxy. The period of each multilayer consists of an Mn layer of varying thickness (0.6 and 5 Å) and a 10 Å thick Ge spacer layer. From temperaturedependent magnetization and hysteresis loop measurements, the Mn (0.6 Å)/Ge (10 Å) multilayer showed very weak ferromagnetic ordering, which is persistent up to 260 K, whereas the Mn (5 Å)/Ge (10 Å) multilayer exhibited strong ferromagnetism up to 305 K. The coercive field of the Mn (5 Å)/Ge (10 Å) multilayer was 277 Oe at 200 K. Density functional electronic band structure calculations on a number of Mn/Ge (001) multilayers determined them to be ferromagnetic, and estimates of their critical temperatures are reported.

Original languageEnglish
Pages (from-to)335-338
Number of pages4
JournalJournal of Superconductivity and Novel Magnetism
Volume18
Issue number3
DOIs
Publication statusPublished - Dec 1 2005

Keywords

  • Ferromagnetism
  • MBE
  • Mn/Ge multilayers

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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