Direct dynamical coupling of spin modes and singlet Josephson supercurrent in ferromagnetic Josephson junctions

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 omega(s) implies a dissipation that is reflected as a depression in the current-voltage curve of the Josephson junction when h omega(s)=2eV. We have thereby performed a resonance experiment on only 10(7) Ni atoms.
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Ivana Petkovic, M. Aprili, S.E. Barnes, Francois Beuneu, S. Maekawa. Direct dynamical coupling of spin modes and singlet Josephson supercurrent in ferromagnetic Josephson junctions. Physical Review B : Condensed matter and materials physics, American Physical Society, 2009, 80, pp.220502. ⟨10.1103/PhysRevB.80.220502⟩. ⟨hal-01068385⟩

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