Recently, many other groups have subsequently reported the existence of the additional asymmetry in the DW speed variation, which implies the existence of new chiral phenomena such as chiral damping. To analyze the additional asymmetry, our group carefully eliminatedthesymmetric contribution (related to the DW energy density)from the DW speed variation,and extracted thepureadditional contribution. The extracted additional contribution exhibits clear antisymmetric nature in logarithmic scaleof the DW speed, and thus ourgroup speculated that the origin of the anti-symmetry comes from the exponent part of the creep scaling law. To demonstrate the origin of the anti-symmetry, the variation of the DW width as a function of an in-plane magnetic field was investigated.In the presentation, our experimental procedures and the detailedanalysis on the DW speed will be discussed. Moreover, at the last part of the presentation, our recent observation on the DW tilting will also be discussed, since its origin was found to berelated tothe symmetric and anti-symmetric contribution in chiral DW speed.

Contact : olivier.boulle@cea.fr