Anomalous magnetic properties and Hall effect in ferromagnetic Co_(2)MnAl epilayers

摘要

Epitaxial films of the full Heusler alloy Co_(2)MnAl were grown on GaAs substrates by molecular-beam epitaxy. The close lattice matching and similar structure to GaAs make this material a good candidate for a spin injector. Magnetization measurements reveal complex ferromagnetic transitions near the Curie point at T_(C)approx-800 K. At room temperature, magnetotransport studies show metallic behavior and a giant Hall effect driven by the extraordinary Hall effect.