We theoretically investigate the micromagnetic dynamics and spin configurations in a CoFeB/Pt nanodisk with varying effective anisotropy constant ( K ) and radius ( R ). It is found that skyrmion and skyrmionium could be stabilized well in a certain region of the phase diagram of topological structures, and their formations physically originated from the competition between exchange interactions and anisotropy contributions. Furthermore, we achieve the transition between the skyrmion and the skyrmionium through fine tuning the magnetic anisotropy. Our results reveal the specific conditions needed to form the equilibrium states of skyrmions and skyrmionium and have significance for the development of skyrmion-based devices.

中文翻译：

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具有垂直磁各向异性的密闭纳米盘中天rm和天rm的形成

我们从理论上研究了CoFeB / Pt纳米盘中具有不同有效各向异性常数（K）和半径（R）的微磁动力学和自旋构型。研究发现，在拓扑结构相图的某个区域中，Skyrmion和Skyrmionium可以很好地稳定下来，它们的形成是物理上源于交换相互作用和各向异性贡献之间的竞争。此外，我们通过微调磁各向异性来实现天蝎子和天蝎子之间的过渡。我们的研究结果揭示了形成天敌离子和天敌离子的平衡状态所需的特定条件，并且对基于天刺离子的器件的开发具有重要意义。