Abstract
Charge transport measurements were performed on La0.7Ca0.3MnO3/YBa2Cu3O7−δ (LCMO/YBCO) trilayer samples. They reveal that the out-of-plane stray field gives rise to flux vortices whose dissipation produces resistance peaks at the coercive fields of the top and bottom LCMO layers. A superconducting surface spin valve effect, similar to the one present in bilayer samples, was also observed in trilayers. These results were observed in the LCMO/YBCO tri-layers below the superconducting transition temperature of the trilayers and are not present in the normal state, which shows the typical two fold magnetoresistance behavior.
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