Magnon-Driven Domain-Wall Dynamics in the presence of Dzyaloshinskii-Moriya Interaction

Started: 17th February 2014
Research Team: Weiwei Wang
Investigators: Hans Fangohr

A head-to-head domain wall start to move due to the spin wave propagation. The DMI exerts a torque to change the domain wall tilt angle when spin waves pass through the domain wall.

A magnetic domain wall will tilt a bit in the presence of Dzyaloshinskii-Moriya Interaction (DMI), in this project we study how the bulk DMI influcnce the domain wall motion driven by spin waves (magnons). We start from a head-to-head domain wall without the DMI, it is reported that the domain wall can be moved by spin waves and the one-dimensional domain wall model shows that the domain wall always moves towards the spin waves source, and this phenomenon can be explained by the angular momentum conservation. Interestingly, in the presence of DMI, we found that (i) the domain wall actually moves either forward or backwards that depends on the sign of DMI constant; (ii) the velocity is much higher than the case without DMI. We attribute this new phenomenon to the linear momentum transfer between the domain wall and magnons.

A more detailed description can be found at Hans Fangohr's blog http://www.southampton.ac.uk/~fangohr/blog/2015-magnon-driven-domain-wall-motion-with-dmi.html.

A related paper is published, Physical Review Letters 114, 087203 (2015) Magnon driven domain wall motion with the Dzyaloshinskii-Moriya interaction, Weiwei Wang, Maximilian Albert, Marijan Beg, Marc-Antonio Bisotti, Dmitri Chernyshenko, David Cortes, Ian Hawke, and Hans Fangohr

Computational Modelling Group

Magnon-Driven Domain-Wall Dynamics in the presence of Dzyaloshinskii-Moriya Interaction

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