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Dynamic evolution of an antivortex on the 200-nm-wide and 10-nm-thick nanodot under a spin-polarized current of . (a)–(k) are the typical magnetic configurations at the indicated times. The colors represent the out-of-plane magnetization, while the arrows indicate the in-plane magnetization.
Core reversal process of an antivortex on the 30-nm-thick nanodot under , involving two Bloch points nucleation, propagation, and annihilation. [(a)–(e)] The colors encode the component of the magnetization and the arrows represent the in-plane (here, -plane of ) magnetization. The plot scales along and directions of the snapshots are 65 and 30 nm, respectively. (f) Maximum magnetic torque vs time during the core reversal. The zero point of time is the moment of the current application.
(a) Temporal variation in the exchange , demagnetizing , and total energies and the normalized component for the 10-nm-thick nanodot under the subthreshold current of . The inset records the trajectory of the core’s displacement motion. (b) Switching time vs the spin current density. The switching time is defined as the time between the current application and the completion of the core reversal, and . The square symbols on the side of represent a quenching event, rather than a reversal of the original core. The inset plots the change in the critical current density with the nanodot thickness.
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