Large Increase of the Critical Field in a Magnet–Superconductor Nanowire Hybrid
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We have fabricated two-dimensional periodic arrays of parallel magnetic and superconducting nanowires on a silicon substrate. Parallel magnetic (nickel) nanowires of cross section 90 nm by 300 nm form a periodic array with Pb 82Bi 18 superconducting nanowires of cross section 200 nm by 100 nm. These nanostructures were characterized with Scanning Electron Microscopy (SEM) and magnetic properties were studied with Magnetic Force Microscopy (MFM). The phase diagram was determined by electrical transport measurements. Depending on the temperature, the second critical field was 2 to 3 times larger than that of a homogeneous Pb 82Bi 18 superconducting control film. The superconducting phase diagram and transport properties exhibit strong hysteresis in a magnetic field. Results are explained on the basis of the theory of magnet-superconductor hybrids. © 2010 Springer Science+Business Media, LLC.
author list (cited authors)
Kim, K., Naugle, D. G., Wu, W., & Lyuksyutov, I. F.