Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 10: Poster Session: Superconductivity
TT 10.48: Poster
Montag, 14. März 2011, 14:00–18:00, P4
Spin transport in diffusive ferromagnetic Josephson junctions with noncollinear magnetization — •Zahra Shomali1, Malek Zareyan1, and Wolfgang Belzig2 — 1Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45195, Iran — 2Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany
We numerically study the Josephson coupling of two s-wave superconductors which are connected through a diffusive contact made of two ferromagnetic domains with the magnetization vectors misoriented by an angle θ. The assumed superconducting leads are conventional s-wave type with the phase difference of ϕ. Using the quantum circuit theory, we find that in addition to the charge supercurrent, which shows a 0−π transition relative to the angle θ, the spin supercurrent with a spin polarization normal to the magnetization vectors will flow through the contact. Our results present a 0-π quantum phase transition as a function of the wave vector, Qξ. Finally, we investigate the spin supercurrent in an extended magnetic texture with multiple domainwalls. We find the behavior of spin supercurrent is highly sensitive to the barrier. When asymmetric barriers don’t change the value of the spin supercurrent, the symmetric ones decrease the value of it notably. We also investigate some other interesting effects for these systems. In addition, we present when Qξ is the even multiple of π, the spin-current which is penetrated into the nonhomogeneous ferromagnets is nearly zero, how ever the odd ones show the large amount of penetrated spin supercurrent.