Spin filtering in a hybrid ferromagnetic-semiconductor microstructure.
We fabricated a hybrid structure in which cobalt and permalloy micromagnets produce a local in-plane spin-dependent potential barrier for high-mobility electrons at the GaAs/AlGaAs interface. Spin effects are observed in ballistic transport in the range of tens of mT of the external field and are attributed to switching between Zeeman and Stern-Gerlach modes--the former dominating at low electron densities.
Wróbel
J
J
Institute of Physics, Polish Academy of Sciences, al Lotników 32/46, 02-668 Warszawa, Poland.
Dietl
T
T
Lusakowski
A
A
Grabecki
G
G
Fronc
K
K
Hey
R
R
Ploog
K H
KH
Shtrikman
H
H