Phase Dynamics of Ferromagnetic Josephson Junctions

I. Petković and M. Aprili
Phys. Rev. Lett. 102, 157003 – Published 16 April 2009

Abstract

We have investigated the classical phase dynamics of underdamped ferromagnetic Josephson junctions by measuring the switching probability in both the stationary and nonstationary regimes down to 350 mK. We found the escape temperature to be the bath temperature, with no evidence of additional spin noise. In the nonstationary regime, we have performed a pump-probe experiment on the Josephson phase by increasing the frequency of the junction current bias. We show that an incomplete energy relaxation leads to dynamical phase bifurcation. Bifurcation manifests itself as premature switching, resulting in a bimodal switching distribution. We directly measure the phase relaxation time τφ by following the evolution of the bimodal switching distribution when varying the bias frequency. Numerical simulations account for the experimental values of τφ.

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  • Received 14 December 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.157003

©2009 American Physical Society

Authors & Affiliations

I. Petković* and M. Aprili

  • Laboratoire de Physique des Solides, UMR 8502, Bâtiment 510, Université Paris-Sud, 91405 Orsay Cedex, France

  • *petkovic@lps.u-psud.fr

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Issue

Vol. 102, Iss. 15 — 17 April 2009

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