Reflectance magnetic circular dichroism studies at the Γ-point in InMnAs semiconductor films

N. D. Parashar, P. T. Chiu, B. W. Wessels*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Magneto-optical activity of InMnAs ferromagnetic semiconductor was measured at the fundamental gap (Γ-point) at room temperature. Reflectance magnetic circular dichroism (MCD) in the polar mode was measured in the mid-infrared from 0.12 to 0.6 eV to determine s,p-d exchange interactions at the zone center (Γ-point). Well-resolved reflectance magnetic circular dichroism spectra in the mid-infrared were measured at 298 K, giving direct evidence for the existence of s,p-d exchange in InMnAs at room temperature. The observed spectrum is attributed to the (Γ8v→Γ6c) transition at the fundamental bandgap in InMnAs. MCD was found to increase with increasing Mn concentration. The signal is strongest in the heavily Mn-doped sample, where a clear enhancement of the response is seen near the band edge (∼0.34 eV). MCD increases with applied magnetic field and eventually saturates at high fields. The temperature dependence of MCD follows closely the magnetization of the films.

Original languageEnglish (US)
Pages (from-to)1147-1150
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume41
Issue number7
DOIs
StatePublished - Jun 2009

Keywords

  • Dilute magnetic semiconductors
  • Indium manganese arsenide
  • Magnetic circular dichroism
  • Spintronics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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