Fabrication and Magnetooptical Properties of Nanostructures of Diluted Magnetic Semiconductors Integrated with Glass Thin Films

概要

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We have fabricated nanostructures of diluted magnetic semiconductors (DMSs) integrated with high-purity glass thin films and have studied the giant magneto-optical properties, for the purpose of applying in microscopic magneto-optical devices. Zn1-x-yCdxMnySe quantum wells grown on GaAs substrates were fabricated into two-dimensional arrays of disks or wires with the lateral dimensions ranging from 10 to 500 nm using electron-beam lithography. These nanostructures have been covered with SiO2 thin films, without a significant degradation of their optical quality, by ultrahigh vacuum sputtering with low plasma damage. The giant Zeeman effects of excitonic photoluminescence (PL) in the integrated nanostructures of DMS are studied in terms of the exchange interactions between exciton and magnetic ions. The magnetic-field dependence of the giant Zeeman shift of excitons shows a redshift beyond 25 meV for 5 T with a significant increase in PL intensity. This ensures characteristic magneto-optical functionalities of the present integrated nano-glass structures of DMS.
2006-06-15