Towards superconducting spintronics with RuO2 and CrO2 nanowires

Prateek, K. (2023)

Doctoral Thesis

CrO2, a half-metal ferromagnet, has shown great promise for superconducting spintronics applications for nearly two decades. Josephson junctions consisting of superconducting (S) contacts on ferromagnetic (F) structures of CrO2, have been shown to sustain remarkably high supercurrents over hundreds of nanometers. However, advancements in this area have been hindered by the metastable nature of CrO2 at ambient conditions. This results in a poorly controlled S-F interface transparency, which is critical for generation of spin triplets. This thesis explores the potential, challenges and possible solutions to overcome the issues with CrO2 devices.

• Superspintronics
• Half-metal ferromagnet
• CrO2
• RuO2
• Selective area growth
• Josephson junctions

• All authors: Prateek, K.
• Supervisor: Aarts, J.
• Committee: Koster, G.; Cirillo, C.; Schalm, K.E.; Lahabi, K.; Molen, S.J. van der
• Qualification: Doctor (dr.)
• Awarding Institution: Leiden Institute of Physics (LION), Faculty of Science, Leiden University
• Date: 2023-12-08
• Title of host publication: Casimir PhD Series
• ISBN (print): 9789085935827
• Name: 2023-35
• Sponsorship: NWO