Current-Induced Nucleation and Motion of Skyrmions in Zero Magnetic Field

Ultrafast switching to zero field topological spin textures in ferrimagnetic TbFeCo films

“…[4][5][6][7][8][9][10] In chiral magnetic thin films, the stabilization of zero field skyrmions can coexist with the Q near 1 condition due to the presence of DMI. 6,[18][19][20][21] However, in centrosymmetric ferromagnetic thin-films, the stabilization of zero field skyrmions requires low-M s and high-K u conditions, which contradicts the simultaneous coexistence of the Q near 1 condition. In contrast, the parameters of K u and M s in ferrimagnets generally show little correlation and can be independently tuned to achieve the combination of low-M s and high-K u by altering the composition of rare earth (RE) -transition metal (TM) alloys, 22,23 which could sustain zero-field skyrmions in centrosymmetric magnetic films.…”

Driving skyrmions with low threshold current density in Pt/CoFeB thin film

“…However, the shape of the hysteresis in figure 1(b) for samples S1 (t CoFeB = 1.5 nm) and S2 (t CoFeB = 1.6 nm) show a sharp change in magnetization (from one saturated state) followed by a relative slow variation before reaching the other saturated state. Usually, in the presence of a finite iDMI and vanishing magnetic anisotropy, such hysteresis loop indicates the presence of a textured (stripes, bubbles, skyrmions) phase as the ground state in the sample [27]. Further, at the part of the hysteresis where the saturation is progressive after the initial drop in magnetization, skyrmion like textures are likely to be stabilized under the presence of a finite external magnetic field.…”

All-Electrical 9-Bit Skyrmion-Based Racetrack Memory Designed with Laser Irradiation

“…The deterministic skyrmion generation with an electrical operation is essential for the realistic design of SkRMs. To date, a few electrical approaches have been employed to drive skyrmion nucleation. ,,− Table summarizes their main characteristics, together with the approach proposed here. A major issue for most of approaches is the temperature gradient resulting from Joule heating (such as nonuniform current-induced SOT, heating tip assisted) which can drive complex skyrmion dynamics. , For the irradiated pinning center-assisted technique, the skyrmion generation is a multistep process involving first a domain formation.…”