Spin Filtering of Hot Holes in a Metallic Ferromagnet

T. Banerjee, E. Haq, M.H. Siekman, J.C. Lodder, R. Jansen

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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 Å in the energy range 0.8 to 2 eV. The hole transmission of a Ni81Fe19/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.
Original languageEnglish
Pages (from-to)027204-1-027204-4
JournalPhysical Review Letters
Volume94
Issue number2
DOIs
Publication statusPublished - 2005
Externally publishedYes

Keywords

  • magnetic multilayers
  • cobalt
  • gold
  • iron alloys
  • nickel alloys
  • hot carriers
  • magnetoelectronics
  • ferromagnetic materials
  • magnetic thin films

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