FMR and voltage induced transport in normal metal-ferromagnet-superconductor trilayers

Abstract

We study the subgap spin and charge transport in normal metal-ferromagnet-superconductor trilayers induced by bias voltage and/or magnetization precession. Transport properties are discussed in terms of time-dependent scattering theory. We assume the superconducting gap is small on the energy scales set by the Fermi energy and the ferromagnetic exchange splitting, and compute the non-equilibrium charge and spin current response to first order in precession frequency, in the presence of a finite applied voltage. We find that the voltage-induced instantaneous charge current and longitudinal spin current are unaffected by the precessing magnetization, while the pumped transverse spin current is determined by spin-dependent conductances and details of the electron-hole scattering matrix. A simplified expression for the transverse spin current is derived for structures where the ferromagnet is longer than the transverse spin coherence length.

10 pages

References in corpus (4)

• A spin triplet supercurrent through the half-metallic ferromagnet CrO2
• Non-collinear Magnetoelectronics
• Spin dynamics in a superconductor / ferromagnet proximity system
• Proximity effect-assisted absorption of spin currents in superconductors

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• Spin-polarized Shapiro steps and spin-precession-assisted multiple Andreev reflection
• Andreev current induced by ferromagnetic resonance
• Superconductivity-enhanced spin pumping: Role of Andreev resonances
• Non-linear spin torque, pumping and cooling in superconductor/ferromagnet systems
• Giant oscillatory Gilbert damping in superconductor/ferromagnet/superconductor junctions