Magnetite: a search for the half-metallic state

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FONIN, Mikhail, Yuriy S. DEDKOV, Rossitza PENTCHEVA, Ulrich RÜDIGER, Gernot GÜNTHERODT, 2007. Magnetite: a search for the half-metallic state. In: Journal of Physics. 19(31), 315217. ISSN 0953-8984. eISSN 1361-648X

@article{Fonin2007Magne-4973, title={Magnetite: a search for the half-metallic state}, year={2007}, doi={10.1088/0953-8984/19/31/315217}, number={31}, volume={19}, issn={0953-8984}, journal={Journal of Physics}, author={Fonin, Mikhail and Dedkov, Yuriy S. and Pentcheva, Rossitza and Rüdiger, Ulrich and Güntherodt, Gernot}, note={Article Number: 315217} }

We present a detailed study of the spin-dependent electronic structure of thin epitaxial magnetite films of different crystallographic orientations. Using spin- and angle-resolved photoelectron spectroscopy at room temperature, we determine for epitaxial Fe3O4(111) films a maximum spin polarization value of −(80 ± 5)% near EF. The spin-resolved photoelectron spectra for binding energies between 1.5 eV and EF show good agreement with the spin-split band structure from density functional theory (DFT) calculations which predict an overall energy gap in the spin-up electron bands in high symmetry directions, thus providing evidence for the half-metallic ferromagnetic state of Fe3O4 in the [111] direction. In the case of the Fe3O4(100) surface, both the spin-resolved photoelectron spectroscopy experiments and the DFT density of states give evidence for a half-metal to metal transition: the measured spin polarization of about − (55±10)%at EF and the theoretical value of −40% are significantly lower than the − 100% predicted by local spin density approximation (LSDA) calculations for the bulk magnetite crystal as well as the −(80 ± 5)% obtained for the Fe3O4(111) films. The experimental findings were corroborated by DFT calculations as due to a surface reconstruction leading to the electronic states in the majority-spin band gap and thus to the reduced spin polarization.<br />(Some figures in this article are in colour only in the electronic version) Pentcheva, Rossitza First publ. in: Journal of Physics. Condensed Matter 19 (2007) 315217 Magnetite: a search for the half-metallic state Rüdiger, Ulrich deposit-license Rüdiger, Ulrich 2007 Fonin, Mikhail application/pdf 2011-03-24T14:52:14Z Dedkov, Yuriy S. Pentcheva, Rossitza Güntherodt, Gernot Güntherodt, Gernot eng 2011-03-24T14:52:14Z Fonin, Mikhail Dedkov, Yuriy S.

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