Tunable Ferromagnetism above Room-temperature in Self-assembled (In, Mn)As Diluted Magnetic Semiconductor Quantum Dots on Be-doped Al_xGa_(1-x)As Template by Molecular Beam Epitaxy

摘要

With the introduction of Be-doped Al_xGa_(1-x)As template, self-assembled In_(0.79)Mn_(0.21)As quantum dots samples were prepared on semi-insulating (001) GaAs substrates by molecular beam epitaxy. High quantum dots density was confirmed by the atomic force microscopy. The ferromagnetism of the samples was revealed by superconducting quantum interference device magnetometer analysis at 10K, and the Curie temperatures ranging from 292 to 314K were able to be regulated by adjusting Al content and Be dopant in Be-doped Al_xGa_(1-x)As templates, implying the feasible application of spintronic devices.