Spin-filter effect in magnetite nanowire.
Spin-dependent electron transport in individual magnetite (Fe3O4) nanowires contacted with normal metallic electrodes was investigated. Such a configured device demonstrated a spin-filter effect, that is, only the minority spin carriers can transport through the magnetite nanowire due to its negative spin polarization. An anomalous positive magnetoresistance approximately 7.5% is observed at room temperature. Moreover, the magnetoresistance can be controlled via bias voltage.
Liao
Zhi-Min
ZM
State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, People's Republic of China.
Li
Ya-Dong
YD
Xu
Jun
J
Zhang
Jing-Min
JM
Xia
Ke
K
Yu
Da-Peng
DP
D003460:Crystallization / Q000379:methods*; D017097:Electric Impedance; D004559:Electric Wiring / Q000295:instrumentation*; D052203:Ferrosoferric Oxide / Q000032:analysis / Q000737:chemistry*; D005374:Filtration / Q000295:instrumentation / Q000379:methods; D008280:Magnetics; D008422:Materials Testing; D008968:Molecular Conformation; D036103:Nanotechnology / Q000295:instrumentation / Q000379:methods*; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D013113:Spin Labels
D013113:Spin Labels; D052203:Ferrosoferric Oxide