Ferromagnetic Josephson Junction with Precessing Magnetization

The Josephson current in a diffusive superconductor-ferromagnet-superconductor junction with precessing magnetization is calculated within the quasiclassical theory of superconductivity. When the junction is phase biased, a stationary current (without ac component) can flow through it despite the nonequilibrium condition. A large critical current is predicted due to a dynamically induced long range triplet proximity effect. Such an effect could be observed in a conventional hybrid device close to the ferromagnetic resonance.

Figure 1

Geometry of the ferromagnetic Josephson junction with precessing magnetization and configuration of dc and rf magnetic fields inducing the ferromagnetic resonance.

Figure 2

Precession frequency dependence of long range (left) and “anomalous” (right) contributions to the critical current for ferromagnetic Josephson junctions with different lengths.