Spin filtering in a hybrid ferromagnetic-semiconductor microstructure
arXiv:cond-mat/0404282 · doi:10.1103/PhysRevLett.93.246601
Abstract
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 tens' millitesla range of the external field, and are attributed to switching between Zeeman and Stern-Gerlach modes -- the former dominating at low electron densities.