Cylindrical magnetic nanowires show promise for applications as one-dimensional structures with tunable properties through shape anisotropy and material parameters. Previous studies focused on long nanowires, where multiple domain walls and Bloch points (BPs) exist, making the control of the BPs challenging. However, Diego Caso and Pablo Tuero, guided by IFIMAC member Farkhad Aliev conducted a detailed investigation of spin wave dynamics in short cylindrical nanowires, specifically when a singular Bloch point-like magnetic texture emerges (see 10.1103/PhysRevApplied.19.064030).
Through micromagnetic simulations and analytic theory, they explored the transition from a single vortex state (quasi-2D spin texture) to a three-dimensional (3D) spin texture in the form of a Bloch point domain wall. Their findings indicate that microwaves and spin currents may be used to switch between these 2D and 3D magnetic textures, offering a novel approach precisely and efficiently to topological magnetic memories based on short cylindrical ferromagnetic nanowires. The proposed implementation generates opposite spin currents using spin orbit torque, as shown in the figure. These results open the door to an energy-efficient magnetic memory alternative utilizing short ferromagnetic cylindrical nanowires. [Full article]
