Abstract
By tuning morphology and size of magnetic subsystem, ferromagnet-superconductor (F/S) hybrid system provides an effective way to modulate superconductivity due to the interaction between superconducting and magnetic-order parameters at the mesoscopic length scale. In this work, we report on investigations of critical current density in a large-area Co/Nb hybrid via facile colloidal lithography. Here, Co hexagon shell array as a magnetic template build on Nb film to modulate the critical current density. A novel superconducting transition has been observed in I-V curve with two metastable transition states: double-transition and binary-oscillation-transition states. Importantly, such unusual behavior can be adjusted by temperature, magnetic field and contact area of F/S. Such hybrid film has important implications for understanding the role of magnetic subsystem modulating superconductivity, as well as applied to low-energy electronic devices such as superconducting current fault limiters.
Highlights
By tuning morphology and size of magnetic subsystem, ferromagnet-superconductor (F/S) hybrid system provides an effective way to modulate superconductivity due to the interaction between superconducting and magnetic-order parameters at the mesoscopic length scale
During the past several years, intensive research efforts have been focused on hybrid F/S systems, and they aimed at modulating superconductivity with magnetic subsystem[4,5,6,7,8,9,10], exploration unusual physical phenomena[11,12], and potential application in electromagnetic devices[13,14,15,16]
It was detected a novel superconducting transition with two resistive transition states from superconducting state (SS) to normal state (NS): one transition has two critical current densities, namely, the resistance change from SS to NS twice according to the value of current densities, we term the double-transition; another transition is the critical current density existing within a certain range not a fixed value, namely, the resistance oscillated between SS and NS in a certain range, we term the binary-oscillation-transition
Summary
By tuning morphology and size of magnetic subsystem, ferromagnet-superconductor (F/S) hybrid system provides an effective way to modulate superconductivity due to the interaction between superconducting and magnetic-order parameters at the mesoscopic length scale. I-V curves reveal that the magnetic template will modulate critical current densities in hybrid.
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