Alternative plasma-oxidized barriers for spin-polarized tunneling

C.H. Kant, J.T. Kohlhepp, C.A.M. Knechten, H.J.M. Swagten, W.J.M. Jonge, de

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Abstract

We have obtained high-quality tunnel junctions with MgO barriers and superconducting Al bottom electrodes by sputter deposition and plasma oxidn. These junctions were used for spin-polarized tunneling measurements in which the Zeeman-split superconducting d. of states is used to det. directly the tunneling spin polarization with Co and Fe top electrodes. Similar attempts with Ta2O5 barriers resulted in poor quality of the superconducting gap, with drastically reduced width, for both Al and V superconducting bottom electrodes. [on SciFinder (R)]
Original languageEnglish
Pages (from-to)2308-2310
JournalIEEE Transactions on Magnetics
Volume40
Issue number4, Pt. 2
DOIs
Publication statusPublished - 2004

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