Magnon-driven domain-wall motion with the Dzyaloshinskii-Moriya interaction.

Research paper by Weiwei W Wang, Maximilian M Albert, Marijan M Beg, Marc-Antonio MA Bisotti, Dmitri D Chernyshenko, David D Cortés-Ortuño, Ian I Hawke, Hans H Fangohr

Indexed on: 15 Mar '15Published on: 15 Mar '15Published in: Physical review letters


We study domain-wall (DW) motion induced by spin waves (magnons) in the presence of the Dzyaloshinskii-Moriya interaction (DMI). The DMI exerts a torque on the DW when spin waves pass through the DW, and this torque represents a linear momentum exchange between the spin wave and the DW. Unlike angular momentum exchange between the DW and spin waves, linear momentum exchange leads to a rotation of the DW plane rather than a linear motion. In the presence of an effective easy plane anisotropy, this DMI induced linear momentum transfer mechanism is significantly more efficient than angular momentum transfer in moving the DW.