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报告人： 汪晨 博士 电子科技大学 报告摘要： Magnetic skyrmions are topological vortex-like textures in chiral magnets which have been predicted theoretically and observed experimentally. In this talk, two new ideas of the magnetic skyrmions will be discussed: 1. A new magnetic soliton, named as twisted skyrmions [1], is predicted to exist at the boundary of two antiferromagnetic coupled ferromagnetic domains. The skyrmion polarity can be efficiently reversed in such configurations, and the twisted skyrmions act as the intermediate state. The barrier of data representation in conventional skyrmion racetrack memory thus removed since one can use skyrmions with different polarities to encode data. 2. By studying a ferromagnet with gain and loss, we have shown that tuning the gain-loss parameter leads to a first-order phase transition from FM to AFM, and the phase transition point corresponds to the exceptional point [2]. As a compelling application of the novel FM-AFM transition, we create an antiferromagnetic skyrmion in the ferromagnet with gain and study its dynamics. [1]. Huanhuan Yang†, C. Wang†, Xiaofan Wang, X. S. Wang, Yunshan Cao, and Peng Yan, Phys. Rev. B 98, 014433 (2018). [2]. Huanhuan Yang†, C. Wang†, Tianlin Yu, Yunshan Cao, and Peng Yan, Phys. Rev. Lett. 121, 197201 (2018). |
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