Switching the magnetization of magnetostrictive nanomagnets from   single-domain to non-volatile vortex states with a surface acoustic wave
  We report manipulation of the magnetic states of elliptical cobalt magnetostrictive nanomagnets (of nominal dimensions ~ 340 nm x 270 nm x 12 nm) delineated on bulk 128{\deg} Y-cut lithium niobate with Surface Acoustic Waves (SAWs) launched from interdigitated electrodes. Isolated nanomagnets that are initially magnetized to a single domain state with magnetization pointing along the major axis of the ellipse are driven into a vortex state by surface acoustic waves that modulate the stress anisotropy of these nanomagnets. The nanomagnets remain in the vortex state until they are reset by a strong magnetic field to the initial single domain state, making the vortex state non-volatile. This phenomenon is modeled and explained using a micromagnetic framework and could lead to the development of extremely energy efficient magnetization switching methodologies. 
Vimal Sampath, Noel \v{d}Souza, Dhritiman Bhattacharya, Gary M.   Atkinson, Supriyo Bandyopadhyay and Jayasimha Atulasimha
cond-mat.mes-hall cond-mat.mtrl-sci