Self-healing patterns in ferromagnetic-superconducting hybrids

Journal Article · Wed Jan 28 00:00:00 EST 2015 · Superconductor Science and Technology

DOI:https://doi.org/10.1088/0953-2048/28/3/035006· OSTI ID:1357060

Vlasko-Vlasov, V. K.; Palacious, E.; Rosenmann, D.; Pearson, J.; Jia, Y.; Wang, Y. L.; Welp, U.; Kwok, W-K

We study magnetic flux dynamic effects in a superconducting bridge with thin soft magnetic stripes placed either on top or under the bridge. Voltage-current (VI) measurements reveal that the edges of magnetic stripes oriented transvers or along the bridge introduce channels or barriers for vortex motion, resulting in the decrease or increase of the critical current, respectively. We demonstrate a remarkable self-healing effect whereby the magnetic pinning strength for the longitudinal stripes increases with current. The self-field of the current polarizes the magnetic stripes along their width, which enhances the stray fields at their edges and creates a dynamic vortex pinning landscape to impede vortex flow. Our results highlight new strategies to engineer adaptive pinning topologies in superconducting-ferromagnetic hybrids.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1357060
• Journal Information: Superconductor Science and Technology, Vol. 28, Issue 3; ISSN 0953-2048
• Publisher: IOP Publishing
• Country of Publication: United States
• Language: English