Path to collapse for an isolated Neel skyrmion

Article

关键词: MAGNETIC SKYRMIONS;    ANISOTROPY;    STABILITY;    DYNAMICS;   

DOI  :  10.1103/PhysRevB.93.214412

来源: SCIE

【 摘 要 】

A path method is implemented in order to precisely and generally describe the collapse of isolated skyrmions in a Co/Pt(111)monolayer, on the basis of atomic scale simulations. Two collapse mechanisms with different energy barriers are found. The most obvious path, featuring a homogeneous shrinking, gives the largest energy, whereas the lowest energy barrier is shown to comply with the outcome of Langevin dynamics under a destabilizing field of 0.25 T, with a lifetime of 20 ns at around 80 K. For this lowest energy barrier path, skyrmion destabilization occurs much before any topology change, suggesting that topology plays a minor role in the skyrmion stability. On the contrary, an important role appears devoted to the Dzyaloshinskii-Moriya interaction, establishing a route towards improved skyrmion stability.

【 授权许可】

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