Anti-Lenz supercurrents in superconducting spin valves
U. D. Chacón Hernández, M. B. Fontes, E. Baggio-Saitovitch, M. A. Sousa, C. Enderlein
DOI 10.1103/PhysRevB.95.184509 · Physical Review B
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Abstract
Here, we present a study on Si(111)/Ta(150Å)/IrMn(150Å)/NiFe(50Å)/Nb(x)/NiFe(50Å)/Ta(50Å) spin valves with x=100−500Å. Samples with a Nb layer thickness of 300Å or higher exhibit an unusual magnetization behavior below Tc. The superconducting Nb layer contributes strongly to the magnetization, and manifests itself in an anomalous hysteresis loop. While the hysteresis loop is seemingly similar to what is generally expected from hard superconductors and many superconductor/ferromagnet hybrid systems, its direction is inverted when compared to what is generally observed. Thus, the samples show paramagnetic behavior for upsweeping fields and diamagnetic behavior for downsweeping fields. This means that the respective samples exhibit a magnetization, which is contrary to what Lenz's rule dictates.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.82 | Pressure not reported | unknown |
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