Saturated ferromagnetism and magnetization deficit in optimally annealed Ga1-xMnxAs epilayers

S. J. Potashnik, K. C. Ku, R. Mahendiran, S. H. Chun, R. F. Wang, N. Samarth, P. Schiffer

Research output: Contribution to journalArticle

138 Scopus citations

Abstract

We examine the Mn concentration dependence of the electronic and magnetic properties of optimally, annealed Ga1-xMnxAs epilayers for 1.35%≤x≤8.3%. The Curie temperature (Tc), conductivity, and exchange energy increase with Mn concentration up to x∼0.05, but are almost constant for larger x, with Tc ∼110 K. The ferromagnetic moment per Mn ion decreases monotonically with increasing x, implying that an increasing fraction of the Mn spins do not participate in the ferromagnetism. By contrast, the derived domain wall thickness, an important parameter for device design, remains surprisingly constant.

Original languageEnglish (US)
Article number012408
Pages (from-to)124081-124084
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number1
DOIs
StatePublished - Jul 1 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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