Abstract
Transmission magnetic circular dichroism (MCD) spectroscopy has been widely used to reveal the spin-dependent band structure of ferromagnetic semiconductors. In these previous studies, some band pictures have been proposed from the spectral shapes observed in transmission MCD; however, extrinsic signals originating from optical interference have not been appropriately considered. In this study, we calculate the MCD spectra taking into account the optical interference of the layered structure of samples and show that the spectral shape of MCD is strongly influenced by optical interference. To correctly understand the transmission MCD, we also calculate the intrinsic MCD spectra of GaMnAs that are not influenced by the optical interference. The spectral shape of the intrinsic MCD can be explained by the characteristic band structure of GaMnAs, that is, the spin-polarized valence band and the impurity band existing above the valence band top.
Highlights
Which is intrinsic to the material, and the intrinsic reflection Magnetic circular dichroism (MCD) spectra.[15]
Which is intrinsic to the material, and the intrinsic reflection MCD spectra.[15]
We have revealed that the anomalous peak appears at ∼2 eV even in the intrinsic MCD spectra of GaMnAs
Summary
Which is intrinsic to the material, and the intrinsic reflection MCD spectra.[15]. For further understanding of the MCD characteristics and band structure of GaMnAs, it is important to understand the transmission MCD of GaMnAs. We found that the spectral shape of transmission MCD depends on the thickness of a non-magnetic layer (e.g. medium 2 in Fig. 1(a)), which usually remains due to the difficulty of the exact depth control of the etching of samples from the backside.
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