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Exchange splitting and bias-dependent transport in EuO spin filter tunnel barriers

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2009

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Miao, Guo-Xing
Moodera, Jagadeesh S.

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https://doi.org/10.1209/0295-5075/88/47006
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EPL (Europhysics Letters). Institute of Physics Publishing (IOP). 2009, 88(4), 47006. ISSN 0295-5075. eISSN 1286-4854. Available under: doi: 10.1209/0295-5075/88/47006

Zusammenfassung

We report on transport measurements in EuO-based tunnel junctions, studying the characteristic features of spin filter tunneling in magnetic insulators. Current-voltage (I-V) curves show a unique voltage dependence that reveals the interplay between direct and spin-selective Fowler-Nordheim (FN) tunneling. Successive onsets of FN tunneling give direct evidence for a spin filtering effect, without relying on the use of external magnetic fields for spin detection. The variation of the effective tunnel barrier height below the Curie temperature was extracted from temperature-dependent I-V characteristics, and systematically correlates with the spontaneous magnetization of EuO. The magnitude of the exchange splitting was deduced and allows the evaluation of spin filter efficiency of EuO spin filter tunnel barriers by fully electrical means.

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ISO 690MÜLLER, Martina, Guo-Xing MIAO, Jagadeesh S. MOODERA, 2009. Exchange splitting and bias-dependent transport in EuO spin filter tunnel barriers. In: EPL (Europhysics Letters). Institute of Physics Publishing (IOP). 2009, 88(4), 47006. ISSN 0295-5075. eISSN 1286-4854. Available under: doi: 10.1209/0295-5075/88/47006
BibTex
@article{Muller2009-12-01Excha-49809,
  year={2009},
  doi={10.1209/0295-5075/88/47006},
  title={Exchange splitting and bias-dependent transport in EuO spin filter tunnel barriers},
  number={4},
  volume={88},
  issn={0295-5075},
  journal={EPL (Europhysics Letters)},
  author={Müller, Martina and Miao, Guo-Xing and Moodera, Jagadeesh S.},
  note={Article Number: 47006}
}
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