Edge-Solitons Meditated Dynamic Switching of Vortex Chirality and Polarity
Abstract
It has attracted great interests to explore efficient methods to control both the polarity and chirality of magnetic vortex in last decades. Here we report a new mechanism to control both the vortex chirality and polarity by electrical current, which is through the formation, decoupling and fusion of edge solitons. Our micromagnetic simulation show that the dynamics of the edge solitons at the disk edge can lead to selective switching of the vortex chirality and polarity. A way to directly write any of the four vortex states from any random states is proposed based on the switching diagram. The switching phase diagram as a function of disk diameters shows that the vortex chirality and polarity switching process is highly size-dependent. As the disk diameter scales down to below 160 nm, the vortex chirality and polarity are coupled together and always switch at the same time, resulting in an unchanged handedness before and after switch. Furthermore, the critical switch current can be as low as 3 *106A / cm 2 . Our work offers an efficient way to control vortex chirality and polarity, which may have great application potential in the low-energy and high-density memory application.
National Natural Science Foundation Of China, Grants No. 11604066.- Publication:
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APS March Meeting Abstracts
- Pub Date:
- 2019
- Bibcode:
- 2019APS..MARR41015L