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

Ivana Petkovic 1 M. Aprili 1 S.E. Barnes 2, 3 Francois Beuneu 4 S. Maekawa 5, 6
1 LPS - Laboratoire de Physique des Solides
2 Department of Physics [Coral Gables]
3 Theory of Condensed Matter Group
4 LSI - Laboratoire des Solides Irradiés
5 WPI-AIMR - WPI Advanced Institute for Materials Research
6 CREST
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.
Keywords : critical currents ferromagnetic materials ferromagnetic resonance interface magnetism Josephson effect magnetic thin films nickel alloys niobium palladium alloys superconducting materials superconducting thin films
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Journal articles
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Submitted on : Thursday, September 25, 2014 - 3:43:25 PM
Last modification on : Wednesday, March 27, 2019 - 4:26:01 PM

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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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