title: Spin filtering of hot holes in a metallic ferromagnet.
abstract: Spin-dependent transport of nonequilibrium holes in ferromagnetic thin films and trilayers is investigated using ballistic hole magnetic microscopy. For Co, the hole attenuation length is short and increases from 6 to 10 A in the energy range 0.8 to 2 eV. The hole transmission of a Ni(81)Fe(19)/Au/Co trilayer is clearly spin dependent, resulting in a surprisingly large current change by a factor of 2.3 in a magnetic field. The energy and spin dependence of the hole transmission cannot be explained by the phase space available for inelastic decay of the hot holes.
authors.affiliation: MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands.
authors.forename: T
authors.initials: T
authors.lastname: Banerjee
authors.forename: E
authors.initials: E
authors.lastname: Haq
authors.forename: M H
authors.initials: MH
authors.lastname: Siekman
authors.forename: J C
authors.initials: JC
authors.lastname: Lodder
authors.forename: R
authors.initials: R
authors.lastname: Jansen