Direct dynamical coupling of spin modes and singlet Josephson supercurrent in ferromagnetic Josephson junctions
I. Petković, M. Aprili, S. E. Barnes, F. Beuneu, S. Maekawa
DOI 10.1103/PhysRevB.80.220502 · Physical Review B
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Abstract
Via a direct coupling between the order parameter and the singlet Josephson supercurrent we detect spin-wave resonances and their dispersion in ferromagnetic Josephson junctions in which the usual insulating or metallic barrier is replaced with a weak ferromagnet. The coupling arises within the Fraunhofer interferential description of the Josephson effect because the magnetic layer acts as a time-dependent phase plate. A spin-wave resonance at a frequency ωs implies a dissipation that is reflected as a depression in the current-voltage curve of the Josephson junction when ℏωs=2eV. We have thereby performed a resonance experiment on only 107 Ni atoms.
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. | 7.6 | Pressure not reported | unknown |
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