title: Opposite spin asymmetry of elastic and inelastic scattering of nonequilibrium holes injected into a ferromagnet.
abstract: The spin asymmetry of elastic and inelastic scattering of nonequilibrium holes injected into Co thin films is examined using a p-type magnetic tunnel transistor. Spin-dependent transmission yields a positive or negative magnetocurrent depending on Co thickness and hole energy. Up to a critical thickness of about 3 nm, (quasi)elastic scattering dominates with a short attenuation length (<1 nm) and preferential attenuation of holes in the majority spin bands, consistent with spin-wave emission. At a larger Co thickness, inelastic scattering dominates with a larger attenuation length ( approximately 4 nm) and opposite spin asymmetry.
authors.affiliation: MESA(+) Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands.
authors.forename: B G
authors.initials: BG
authors.lastname: Park
authors.forename: T
authors.initials: T
authors.lastname: Banerjee
authors.forename: J C
authors.initials: JC
authors.lastname: Lodder
authors.forename: R
authors.initials: R
authors.lastname: Jansen