Bipolar spin-valve effect in complex-oxide superconductor/half-metallic ferromagnet junctions
Aurélien Lagarrigue, David Sanchez-Manzano, Santiago José Carreira, Fabian A. Cuellar, Xavier Palermo, Anke Sander, Vincent Humbert, Javier Briatico, Jacobo Santamaria, Juan Trastoy, Salvatore Mesoraca, Javier E. Villegas
DOI 10.1103/gr8k-15wt · Physical Review Materials
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Abstract
Superconductor/ferromagnet (S/F) interfaces are fertile ground for emergent phenomena that result from competing interactions and proximity effects. Beyond their fundamental interest, these phenomena can be exploited in devices to create novel functionalities. Here, we realize all-oxide junctions based on S/F/S/F/S heterostructures that combine the high-TC S YBa2Cu3O7−x and the half-metallic F La0.7Sr0.3MnO3, in which electrical transport is measured in current-perpendicular-to-plane configuration. These junctions show a spin-valve effect: their electrical resistance switches as the relative orientation of the magnetizations of the F layers is switched from parallel to antiparallel by a magnetic field. However, their behavior is unusual: in contrast to conventional spin valves, whether the resistance increases or decreases upon switching depends on temperature. This can be understood considering the interplay between superconducting proximity effects, spin-dependent scattering, and magnetic exchange effects. These results show a path towards high-temperature superconducting spin-valve devices for advanced quantum sensing.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 50 | Pressure not reported | onset |
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