Metal-semiconductor transition and magnetic properties of epitaxially grown MnAsGaAs superlattices

J. H. Song, Y. Cui, J. J. Lee, S. L. Cho, J. B. Ketterson

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

We successfully grew epitaxial MnAsGaAs superlattices at various growth temperatures (Tg) with a periodicity of 55 nm using molecular-beam epitaxy and characterized their magnetic and electrical transport properties. Structural analysis shows that the magnetic anisotropy originates from the crystal domain structure of the MnAs layers. The metallic behavior for the sample with Tg =375 °C systematically changed to semiconducting on increasing Tg up to 540 °C. The transport properties of thin single layered MnAs films with a thickness of 20 nm showed the same Tg dependency. These observations indicate that the semiconducting characteristics of MnAsGaAs superlattices are attributable to a radical alteration of the electronic structure of the MnAs layers.

Original languageEnglish (US)
Article number07B501
JournalJournal of Applied Physics
Volume103
Issue number7
DOIs
StatePublished - Apr 21 2008

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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