Direct observation of a positive spin polarization at the (111) surface of magnetite

Andrew Pratt, Mitsunori Kurahashi, Xia Sun, Daniel Gilks, Yasushi Yamauchi

Research output: Contribution to journalArticlepeer-review

Abstract

We report direct experimental evidence showing that the spin polarization P at the surface of clean Fe3O4(111) is positive at the Fermi level EF as measured using a spin-polarized metastable helium beam [He(23S)] and a bulk Fe3O4(111) single crystal under high magnetic fields of up to 4 T. Density functional theory calculations confirm this surprising result, which has significant implications for the incorporation of magnetite in spintronic device applications. We also find that passivation of the surface with hydrogen does not enhance P(EF), unlike for the Fe3O4(001) surface, where a marked increase is observed.
Original languageEnglish
Article number180409(R)
Number of pages4
JournalPhysical Review B (Rapid Communications)
Volume85
Issue number18
Early online date25 May 2012
DOIs
Publication statusPublished - 25 May 2012

Keywords

  • MAGNETITE
  • SPIN POLARIZATION
  • SURFACE

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