Spin filtering of hot holes in a metallic ferromagnet.
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.
Banerjee
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MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands.
Haq
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E
Siekman
M H
MH
Lodder
J C
JC
Jansen
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R