Figure 2. Temporal evolution of vortex-core orientation during resonant core precession and reversal.

(a) Trajectories (red color) of vortex-core orientation Λ = (Λ_x, Λ_y, Λ_z), which motion is resonantly excited by a circular rotating field, with H_AC = 10 Oe and f_CCW = 51 MHz, while applying a static field along the z axis (, H_DC = 100 Oe). The left and right panels correspond to the core motions during t = 0‒109 ns and t = 109‒200 ns, respectively. The blue, green, and orange arrows represent the core orientation at t = 0, 109, and 200 ns, respectively. (b) Temporal variation of x, y, z components of core orientations, Λ_x, Λ_y, and Λ_z.