Experimental verification of contact-size estimates in point-contact spectroscopy on superconductor/ferromagnet heterocontacts

preprint2012arXivOpen access

Abstract

Nanostructured superconductor/ferromagnet heterocontacts are studied in the different transport regimes of point-contact spectroscopy. Direct measurements of the nanocontact size by scanning electron microscopy allow a comparison with theoretical models for contact-size estimates of heterocontacts. Our experimental data give evidence that size estimates yield reasonable values for the point-contact diameter dd as long as the samples are carefully characterized with respect to the local electronic parameters.

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