Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 35: Spintronics (other effects) (joint session MA/TT)

MA 35.2: Vortrag

Mittwoch, 11. März 2026, 15:30–15:45, POT/0112

Ignition of spin-triplet supercurrent in a ballistic S/F/S Josephson junction with precessing magnetization — •Elizaveta Andriyakhina, Miad Mansouri, Maxim Breitkreiz, and Piet Brouwer — Freie Universität Berlin, Germany

We develop a theory for a ballistic Josephson junction with a ferromagnetic (including half-metallic) interlayer whose uniformly precessing magnetization generates a controllable equal-spin (triplet) supercurrent. In a co-rotating frame, the driven junction maps to an effective static problem that can be treated with a scattering-matrix approach to obtain Andreev bound states and the dc Josephson current.

A key result is that steady precession produces a spin-dependent non-equilibrium occupation in the rotating frame, yielding a finite dc supercurrent. In the half-metal limit the junction is ``off" without precession, but becomes ``on" when a finite precession angle induces phase-sensitive Andreev levels and a triplet current.

For small precession angles, the induced current is approximately sinusoidal in phase and the critical current scales quadratically with the precession angle (and with drive parameters), enabling microwave-controlled switching via ferromagnetic resonance.

Keywords: superconducting spintronics; spin-polarized currents; half-metal/ferromagnet proximit