Micromagnetic simulations are used to investigate the motion of magnetic skyrmions in an in-plane strain gradient. The skyrmion diameter and energy are found to depend on the strain, which leads to a force that moves the skyrmion toward regions with higher strain. An analytical expression for the skyrmion velocity as a function of the strain gradient is derived assuming a rigid profile for the skyrmion, and good agreement with simulations is obtained. Furthermore, electromechanical simulations of a hybrid ferromagnetic/piezoelectric device show that the in-plane strain gradients needed to move skyrmions can be achieved by applying moderate voltages in the piezoelectric substrate, which offers an original way to control skyrmion motion efficiently.
Skyrmion motion induced by voltage-controlled in-plane strain gradients
R. Yanes, F. Garcia-Sanchez, R. F. Luis, E. Martinez, V. Raposo, L. Torres, L. Lopez-Diaz; Skyrmion motion induced by voltage-controlled in-plane strain gradients. Appl. Phys. Lett. 23 September 2019; 115 (13): 132401. https://doi.org/10.1063/1.5119085
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