TY - GEN
T1 - A novel class of high-TC ferromagnetic semiconductors novel ferromagnetic semiconductors
AU - Shlyk, L. V.
AU - Kryukov, S. A.
AU - De Long, L. E.
AU - Lynn, J. W.
AU - Huang, Qing
AU - Schüpp-Niewa, B.
AU - Niewa, R.
AU - Arenholz, E.
AU - Piamonteze, C.
PY - 2008
Y1 - 2008
N2 - We have grown single crystals of novel ruthenates (Sr,Ba)(Fe,Co) 2+xRu4-xO11 that exhibit long-range ferromagnetic order well above room temperature, accompanied by narrow-gap semiconducting properties that include a large anomalous Hall conductance, low resistivity, high carrier concentration and low coercive field, which are properties well suited to spintronic applications. X-ray diffraction, EDX, neutron diffraction and x-ray absorption measurements on single crystals firmly establish the "R-Type" hexagonal ferrite structure (space group P63/mmc, No 194) and single-phase nature of all samples. The electronic structure and physical properties can be tuned by simple chemical substitution of two elements, M = Fe or Co, or by varying the relative concentration of 3d solutes and 4d Ru. Our magnetotransport, x-ray magnetic circular dichroism and magnetic moment data suggest the mechanism for FM order is quite different from that governing known dilute magnetic semiconductors.
AB - We have grown single crystals of novel ruthenates (Sr,Ba)(Fe,Co) 2+xRu4-xO11 that exhibit long-range ferromagnetic order well above room temperature, accompanied by narrow-gap semiconducting properties that include a large anomalous Hall conductance, low resistivity, high carrier concentration and low coercive field, which are properties well suited to spintronic applications. X-ray diffraction, EDX, neutron diffraction and x-ray absorption measurements on single crystals firmly establish the "R-Type" hexagonal ferrite structure (space group P63/mmc, No 194) and single-phase nature of all samples. The electronic structure and physical properties can be tuned by simple chemical substitution of two elements, M = Fe or Co, or by varying the relative concentration of 3d solutes and 4d Ru. Our magnetotransport, x-ray magnetic circular dichroism and magnetic moment data suggest the mechanism for FM order is quite different from that governing known dilute magnetic semiconductors.
KW - Ferromagnetic semiconductors
KW - Mechanisms of ferromagnetism
KW - R-Type ferrites
KW - Ruthenates
KW - Spintronics
UR - https://www.scopus.com/pages/publications/51849166041
UR - https://www.scopus.com/pages/publications/51849166041#tab=citedBy
U2 - 10.1109/UGIM.2008.45
DO - 10.1109/UGIM.2008.45
M3 - Conference contribution
AN - SCOPUS:51849166041
SN - 9781424424849
T3 - Biennial University/Government/Industry Microelectronics Symposium - Proceedings
SP - 142
EP - 147
BT - 2008 17th Biennial University/Government/Industry Micro-Nano Symposium - Proceedings, UGIM
T2 - 2008 17th Biennial University/Government/Industry Micro-Nano Symposium - UGIM
Y2 - 13 July 2008 through 16 July 2008
ER -