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Spin-polarized tunneling spectroscopy in tunnel junctions with half-metallic electrodes

M. Bowen·A. Barthélémy·M. Bibes·E. Jacquet·J. -P. Contour·A. Fert·F. Ciccacci·L. Dùo·R. Bertacco
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Abstract

We have studied the magnetoresistance (TMR) of tunnel junctions with electrodes of La2/3Sr1/3MnO3 and we show how the variation of the conductance and TMR with the bias voltage can be exploited to obtain a precise information on the spin and energy dependence of the density of states. Our analysis leads to a quantitative description of the band structure of La2/3Sr1/3MnO3 and allows the determination of the gap delta between the Fermi level and the bottom of the t2g minority spin band, in good agreement with data from spin-polarized inverse photoemission experiments. This shows the potential of magnetic tunnel junctions with half-metallic electrodes for spin-resolved spectroscopic studies.

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M. Bowen, A. Barthélémy, M. Bibes, E. Jacquet, J. -P. Contour, A. Fert, F. Ciccacci, L. Dùo, R. Bertacco. 2005-08-23. Spin-polarized tunneling spectroscopy in tunnel junctions with half-metallic electrodes. https://doi.org/10.1103/physrevlett.95.137203

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