Growth of InMnAsSb/InSb heterostructures with mid-infrared light-induced ferromagnetic properties

New diluted magnetic semiconductor InMnAsSb/InSb hetero structures were proposed and grown on InAs substrates by low-temperature molecular beam epitaxy. Raman scattering measurements show that InMnAsSb layer grown on InSb at 250 degreesC has higher crystal quality than that grown at 280 degreesC. Light-induced ferromagnetic order was observed, for the first time, when these samples were illuminated with the light of wavelengths longer than 2 mum. Corresponding to the Raman data, better light-induced ferromagnetic order was for the 250 degreesC-grown samples. The long-term preservation of the ferromagnetic order was confirmed even after the light-off.