Journal
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS
Volume 43, Issue 2A, Pages L233-L236Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.43.L233
Keywords
ferromagnetism; delta doping; Mn; GaAs; magnetic semiconductor; heterostructure; selective doping
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We demonstrate the electrical and optical control of ferromagnetism in semiconductor heterostructures at high temperatures of 100-117 K. The heterostructures consist of Mn delta (delta)-doped GaAs and p-type AlGaAs. We are able to isothermally change the paramagnetic state to the ferromagnetic state and vice versa, by applying a gate electric-field or by light irradiation. The large modulation of T-C (Delta T-C similar to 15 K) at high temperatures (> similar to100 K) demonstrated here may pave the way for functional device applications compatible with the present semiconductor technology.
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