Article ID Journal Published Year Pages File Type
1545244 Physica E: Low-dimensional Systems and Nanostructures 2009 4 Pages PDF
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.

Related Topics
Physical Sciences and Engineering Materials Science Electronic, Optical and Magnetic Materials
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