Puzzling magneto-optical properties of ZnMnO films
M. Godlewski, A. Wasiakowski, V.Yu. Ivanov, A. Wojcik-Glodowska, M., Lukasiewicz, E. Guziewicz, R. Jakiela, K. Kopalko, A. Zakrzewski
TL;DR
This paper investigates the unusual magneto-optical properties of ZnMnO films, revealing strong excitonic polarization without typical spectral shifts, and suggests Mn recharging as a key mechanism affecting optical behavior.
Contribution
It presents novel observations of polarization effects in ZnMnO films and proposes a new explanation involving Mn recharging in the lattice.
Findings
Strong polarization of excitonic photoluminescence observed
Absorption onset at about 2.1 eV related to Mn ionization
Potential Mn recharging mechanism influencing optical properties
Abstract
Optical and magneto-optical properties of ZnMnO films grown at low temperature by Atomic Layer Deposition are discussed. A strong polarization of excitonic photoluminescence is reported, surprisingly observed without splitting or spectral shift of excitonic transitions. Present results suggest possibility of Mn recharging in ZnO lattice. Strong absorption, with onset at about 2.1 eV, is related to Mn 2+ to 3+ photo-ionization. We propose that the observed strong circular polarization of excitonic emission is of a similar character as the one observed by us for ZnSe:Cr.
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