Quantum magnetization reversal studied in S/F/S Josephson φ₀ junction

We study quantum tunneling of magnetization in the presence of the bias current and the magnetic field along the general direction in the Josephson φ₀ junction. With account taken of the influence of the superconductivity on the ferromagnet in the kelvin or subkelvin range, we present the analytic formulas of the tunneling rate in the uniaxial and nonuniaxial symmetries, and find that the tunneling exponents depend on three parameters related to the current and the magnetic field. We demonstrate that the current is equivalent to the effect of the magnetic field along the easy axis and the tunneling rate can be shifted by the bias current in the presence of such an external magnetic field. These features are expected to be observable with existing experimental techniques.