Fabrication and characterization of ferromagnetic-superconducting hybrid films grown by combined PVD techniques

Ozmetin A., Ongun E., Kuru M., Yazici E.

Applied Surface Science, cilt.350, ss.2-5, 2015 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Özet
  • Cilt numarası: 350
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1016/j.apsusc.2015.02.080
  • Dergi Adı: Applied Surface Science
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.2-5
  • Anahtar Kelimeler: Magnetic thin films, Permalloy, Superconductivity, Superconductor ferromagnet hybrids
  • Ondokuz Mayıs Üniversitesi Adresli: Hayır

Özet

This study reports micro-fabricated magnet and superconductor (permalloy/Pb 82 Bi 18 ) hybrid film structures sequentially grown by magnetron sputtering and thermal deposition techniques. 300 nm thick PbBi film was quench condensed on top of a patterned permalloy film. Permalloy film was sputtered and patterned to form few micrometer-wide stripes. Ferromagnetic and superconducting layers were separated by Al 2 O 3 insulation. Transport superconducting properties, i.e. transition temperature T C (H) and second critical field H C2 (T) were measured in a range of applied magnetic field between H = 0 and H = 7 kOe for the hybrid system and a control sample with only a layer of superconducting film deposited. The H C2 (T) data showed that due to the interplay between the superconducting film and the ferromagnet, superconducting (SC) and normal current paths formed on the SC film.