Spin-polarized Shapiro steps and spin-precession-assisted multiple Andreev reflection

Abstract

We investigate the charge and spin transport of a voltage-biased superconducting point contact coupled to a nanomagnet. The magnetization of the nanomagnet is assumed to precess with the Larmor frequency, ${\omega }_L$, due to ferromagnetic resonance. The interplay between the ac Josephson current and the magnetization dynamics leads to spin-polarized Shapiro steps at voltages $|V|=\hslash {\omega }_L/2en$ for $n=1,2,...$ and the subharmonic steps with $n>1$ are a consequence of multiple Andreev reflection (MAR). Moreover, the spin-precession-assisted MAR generates quasiparticle scattering amplitudes that, due to interference, lead to current-voltage characteristics of the dc charge and spin currents with subharmonic gap structures displaying an even-odd effect.

5 pages, 4 figures

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Cited by in corpus (10)

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• Theory of Andreev Bound States in S-F-S Junctions and S-F Proximity Devices
• Tunneling processes between Yu-Shiba-Rusinov bound states
• Locking of magnetization and Josephson oscillations at ferromagnetic resonance in ${\phi }_0$ junction under external radiation
• Spin-polarized multiple Andreev reflections in spin-split superconductors
• Non-linear spin torque, pumping and cooling in superconductor/ferromagnet systems
• Collective magnetic and plasma excitations in Josephson $\psi$ junctions
• Spin transport through a nanojunction with a precessing anisotropic molecular spin: Quantum interference and spin-transfer torque
• Magnetization near a constriction between BCS superconductors by spin-dependent tunneling