Electrical creation and magnetic-field-free switching of magnetic bimeron lattices

As potential candidates for the next generation of memory and logic devices, topological spin textures, such as skyrmions and magnetic bobbers, have attracted great research interests in the past decade. For promising applications, the magnetic-field-free creation and manipulation of such topological spin textures are highly desirable. In this work, we numerically demonstrate the electrical deterministic creation and zero-field switching between bimeron and antibimeron lattices in a magnetic film with three-dimensional Dzyaloshinskii-Moriya interaction. The switching process is found to be assisted by the electrical excitation of a collective dynamic mode in the (anti)bimeron lattice and can be mapped to the current-induced switching of a minimal easy-axis model with uniform magnetization. The opposite net in-plane magnetic moments of the bimeron and antibimeron lattices allow their electrical readout via the tunneling magnetoresistance in conventional spin valve geometry. Our results not only provide new perspectives on the generation of topological magnetic crystals and the driving of their dynamics purely by electrical means, but also reveal the opportunity to design and discover unconventional behaviors of topological spin textures by tailoring the Dzyaloshinskii-Moriya interaction.