Room-temperature ferromagnetism and terahertz emission of Mn-doped InGaAs and GaAsSb nanowires.
Ferromagnetic Mn-doped In(0.05)Ga(0.95)As and GaAs(0.95)Sb(0.05) nanowires were synthesized by chemical vapor transport and their Mn concentration was about 2%. The Mn doped homogeneously into both the single-crystalline zinc blende InGaAs and GaAsSb without the formation of metal clusters. X-ray magnetic circular dichroism and magnetic moment measurements revealed their distinctive room-temperature ferromagnetic behaviors. While the incorporation of In enhances the ferromagnetism, that of Sb reduces it, which can be ascribed to the increase or decrease of the dopant-acceptor hybridization. These GaAs-based NWs exhibit an efficient terahertz emission at room temperature, due to a strong local field enhancement by coherent surface plasmons. The Mn doping significantly enhances the intensity and bandwidth of the terahertz emission, with an excellent correlation with their magnetization.
Kong
Kang Jun
KJ
Department of Chemistry, Korea University, Jochiwon, Korea.
Jung
Chan Su
CS
Jung
Gyeong Bok
GB
Cho
Yong Jae
YJ
Kim
Han Sung
HS
Park
Jeunghee
J
Yu
Nan Ei
NE
Kang
Chul
C