Spin-precession-induced currents through ferromagnet/nanomagnet/superconductor junctions
College of Science, Nanjing University of Aeronautics
and Astronautics, Jiangsu
Received in final form: 20 September 2013
Published online: 20 November 2013
The spin-precession-induced current through ferromagnet/nanomagnet/superconductor junctions is investigated by using the nonequilibrium Green’s function method. It is found that the charge current Ic for the spin precession frequency ω less than the energy gap Δ only arises from the equal-spin Andreev reflection, which is independent of the spin polarization p of the ferromagnetic lead, while that for ω > Δ mainly originates from the quasiparticle’s contribution. Both equal-spin AR and quasiparticle scattering processes contribute to the spin current Is and the quasiparticle scattering process plays a dominant role. While Ic for ω < Δ can be enhanced by the spin polarization p, Is decreases with p. These features may be of interest for ongoing experiments in the field of molecular spintronics.
Key words: Mesoscopic and Nanoscale Systems
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2013