Modeling of 180° magnetization switching and clock sensitivity in a tilted multiferroic nanomagnet

In this paper, the dynamic magnetization model of multiferroic elliptical nanomagnets with different tilt angles is established. Simulation of dynamic magnetization is performed through micromagnetic method. The results show that the clock sensitivities are different for nanomagnets with different tilt angles. For tilt angles below 9°, the larger the tilt angle is, the smaller the stress required for the nanomagnet to flip to the "Null" state is. Encouragingly, 180° switching of tilted nanomagnet can be achieved by applying a bias magnetic field together with stress, even if the nanomagnet is at a high aspect ratio (2:1). However, nanomagnet with excessively large tilt angle (>10°) tends to yield a vortex process during switching. As a consequence, stress duration will be longer, and larger bias magnetic field will be required for 180° switching. Therefore, nanomagnets inclined more than 10° should be avoided in magnetic design. These findings can provide important guidance for the design of multiferroic nanomagnetic logic as well as memory storage.