Quantum tunneling of the magnetic moment in the S/F/S Josephson φ0 junction

Eugene M. Chudnovsky

doi:10.1103/PhysRevB.93.144422

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Quantum tunneling of the magnetic moment in the S/F/S Josephson φ0 junction

Eugene M. Chudnovsky

DOI 10.1103/PhysRevB.93.144422 · Physical Review B

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Abstract

We show that the S/F/S Josephson φ0 junction permits detection of macroscopic quantum tunneling and quantum oscillation of the magnetic moment by measuring the ac voltage across the junction. Exact expression for the tunnel splitting renormalized by the interaction with the superconducting order parameter is obtained. It is demonstrated that magnetic tunneling may become frozen at a sufficiently large φ0. The quality factor of quantum oscillations of the magnetic moment due to finite ohmic resistance of the junction is computed. It is shown that magnetic tunneling rate in the φ0 junction can be controlled by the bias current, with no need for the magnetic field.