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Spin polarization at ferromagnet-insulator interfaces : The important role of stoichiometry in MgO/Fe(001)

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2007

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Matthes, Frank
Schneider, Claus M.

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https://doi.org/10.1209/0295-5075/80/17007
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EPL (Europhysics Letters). Institute of Physics Publishing. 2007, 80(1), 17007. ISSN 0295-5075. eISSN 1286-4854. Available under: doi: 10.1209/0295-5075/80/17007

Zusammenfassung

The electronic structure of ferromagnet-insulator interfaces plays a key role in spin-dependent transport processes by determining the spin polarization of the tunneling charge carriers. Employing spin-polarized, angle-resolved photoelectron spectroscopy we studied the spin-resolved electronic structure in the model system MgO/Fe(001) and observed a surprisingly multifaceted influence of the MgO stoichiometry. In particular, oxygen-deficient MgO barriers are found to strongly enhance the interfacial spin polarization. The results highlight the important role of the specific nature of the oxygen bonding and its relevance for the tunnel magnetoresistance effect.

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ISO 690MÜLLER, Martina, Frank MATTHES, Claus M. SCHNEIDER, 2007. Spin polarization at ferromagnet-insulator interfaces : The important role of stoichiometry in MgO/Fe(001). In: EPL (Europhysics Letters). Institute of Physics Publishing. 2007, 80(1), 17007. ISSN 0295-5075. eISSN 1286-4854. Available under: doi: 10.1209/0295-5075/80/17007
BibTex
@article{Muller2007-10-01polar-49710,
  year={2007},
  doi={10.1209/0295-5075/80/17007},
  title={Spin polarization at ferromagnet-insulator interfaces : The important role of stoichiometry in MgO/Fe(001)},
  number={1},
  volume={80},
  issn={0295-5075},
  journal={EPL (Europhysics Letters)},
  author={Müller, Martina and Matthes, Frank and Schneider, Claus M.},
  note={Article Number: 17007}
}
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