Leiden University Student Repository

Pleijster, Menno Lars (2016)

In search of triplet superconductivity in lateral cobalt Josephson junctions

Master thesis | Physics (MSc)

Triplet superconductivity in lateral Josephson junctions has only been shown in the ferromagnet CrO2. We succeeded in creating a disk-shaped lateral cobalt Josephson junction with a trench width below 20 nm. The device shows promising signs of superconducting triplet correlations. For exchange fields up to 15 mT we see an increase in the critical current, possibly caused by an increase of the magnetic non-collinearity as the Ni generating layer aligns with the field. We also observe oscillations in the critical current. These oscillations have a period of approximately 4 mT and are believed to be the result of a flux quantisation effect in the superconducting cobalt disk.

triplet

superconductivity

cobalt

lateral

Josephson

junction

Author

Pleijster, Menno Lars

Faculty

Faculty of Science

Specialisation

Experimental Physics

Supervisors

Aarts, Jan

ECTS Credits

36

Language

en