Piezostrain as a Local Handle to Control Gyrotropic Dynamics of Magnetic Vortices

Power-saving solutions are sought for manipulating the dynamics of magnetic microelements in emerging spintronic rf devices. The authors show that local piezostrain is an efficient extrinsic means to control the gyrotropic motion of magnetic vortices, with low voltages and all-electrical operation. In addition, they find that the frequency-strain tuning ratio scales inversely with the size of the vortex-based microdevice. Their approach offers an extra dimension in the frequency tuning of vortex-based spintronic oscillators.