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Séminaire « Magnétisme et Physique du spin »

Spin torque driven chiral domain walls in magnetic heterostructures - Jacob Torrejon Diaz - 16 octobre 2014 à 11 h

Jacob Torrejon Diaz - Post-doctorat à l’UMR CNRS-Thales

Jeudi 16 octobre à 11h - INSP - 4 place Jussieu - 75252 PARIS Cedex 05 - Barre 22-32 - 2e étage, salle 201 Abstract

The motion of magnetic domain walls in ultrathin magnetic heterostructures driven by current via the spin Hall torque is described. We show results from perpendicularly magnetized CoFeB|MgO heterostructures with various heavy metal underlayers. The domain wall moves along or against the current flow depending on the underlayer material. The direction to which the domain wall moves is associated with the handedness of the domain wall spiral formed in these heterostructures. The one-dimensional model is used to describe the experimental results and extract parameters such as the Dzyaloshinskii-Moriya exchange constant which is responsible for the formation of the domain wall spiral. Fascinating effects arising from the control of interfaces in magnetic heterostructures are described.