Abstract
Hybrid systems of thin films of oxide ferromagnets and high-temperature superconductors have been investigated by scanning Hall probe microscopy (SHPM) to analyze the local magnetic flux density distribution at low temperatures. In addition to the intrinsic properties of the films themselves, such structures exhibit novel phenomena due to complex interactions arising at the interface between them. The latter can be divided into processes originating from either electronic or magnetic coupling, respectively. As a direct consequence, the distribution of vortices in the superconductor is strongly influenced by the magnetic background arising from the ferromagnet. The local magnetic information obtained from SHPM images provides clear evidence for the presence of a magnetic dipolar interaction between the magnetic domains of the ferromagnetic component and the vortex ensemble in the superconductor.
Highlights
PII: S1367-2630(07)55378-4 © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft generally leads to the suppression of both transition temperatures [2, 3]
We show for the first time spatially-resolved measurements of the local interaction between magnetic domain patterns in a ferromagnetic LCMO layer and flux line distributions in an adjacent YBCO layer
If an external magnetic field is applied to this state, there are strong interactions between this spontaneous magnetic ‘template’ and additional flux lines penetrating into the superconductor
Summary
PII: S1367-2630(07)55378-4 © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft generally leads to the suppression of both transition temperatures [2, 3]. We show for the first time spatially-resolved measurements of the local interaction between magnetic domain patterns in a ferromagnetic LCMO layer and flux line distributions in an adjacent YBCO layer. If an external magnetic field is applied to this state, there are strong interactions between this spontaneous magnetic ‘template’ and additional flux lines penetrating into the superconductor.
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