Enhancement of flux-line pinning in all-oxide superconductor/ferromagnet heterostructures
H.-U. Habermeier, J. Albrecht, S. Soltan (MPI-FKF, Stuttgart,, Germany)
TL;DR
This study investigates how ferromagnetic layers influence flux-line pinning and critical current density in YBa2Cu3O7 superconductor/ferromagnet heterostructures, revealing hysteresis effects linked to magnetic interactions.
Contribution
It provides new insights into flux pinning enhancement through ferromagnetic layers in all-oxide superconductor/ferromagnet heterostructures.
Findings
Hysteresis in critical current density linked to ferromagnetic magnetization
Magneto-optic measurements reveal magnetic vortex-wall interactions
Enhanced flux pinning observed in bilayer structures
Abstract
We have studied the local critical current density, jc, in the superconductor thin film of bilayer structures consisting of YBa2Cu3O7 and the ferromagnets La2/3Ca1/3MnO3 and SrRuO3, respectively, by means of quantitative magneto-optics. A pronounced hysteresis of jc was observed which is ascribed to the magnetization state of the ferromagnetic layer. The results are discussed within the frame of magnetic vortex - wall interactions.
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