Spin torque on magnetic domain walls exerted by supercurrents
CFIF, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
2 Departamento de Física, Universidade de Évora, 7000-671 Évora, Portugal
Corresponding author: a email@example.com
Revised: 3 May 2010
Published online: 10 June 2010
We calculate the spin density, spin currents and spin torque due to a spin polarized current on a magnetic domain wall juxtaposed to or inserted in a conventional superconductor. The superconductor is part of a heterostructure of the type NSN or FSF. In general, the spin torque exerted on the domain wall is weaker with respect to a normal metal. However, there are regimes where the torque is enhanced with respect to the normal metal. In these regimes the motion of the domain wall is therefore more efficient. A notable case is the passing of an unpolarized current which leads to a finite torque in the case of the superconductor.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2010