Eigenmodes of Néel skyrmions in ultrathin magnetic films
Eigenmodes of Néel skyrmions in ultrathin magnetic films
复制标题
DOI：
10.1063/1.4983806
复制
发表时间：
2016-12
期刊：
影响因子：
1.6
通讯作者：
V. L. Zhang;C. Hou;K. Di;H. Lim;S. Ng;S. Pollard;Hyunsoo Yang;M. H. Kuok
中科院分区：
文献类型：
--
作者：
V. L. Zhang;C. Hou;K. Di;H. Lim;S. Ng;S. Pollard;Hyunsoo Yang;M. H. Kuok
对具有界面Dzyaloshinskiii-Moriya相互作用（Dzyaloshinskiii-Moriya interaction，Dzyaloshinskii-Moriya interaction）的铁磁薄膜中Neel skyrmions的静态和动态进行了微磁学模拟，并将其作为界面Dzyaloshinskiii-Moriya相互作用强度和外加静磁场的函数.研究结果表明，虽然呼吸，逆时针（CCW）和顺时针（CW）旋转本征模存在于Skyrmion晶格（SkL）阶段，只有前两个模式存在于孤立的Skyrmion（ISk）阶段。此外，CCW模的本征频率对磁场驱动的SkL−ISk相变不敏感，Skyrmion间的相互作用主要是激发SkL相中的CW模。研究结果提供了物理洞察动力学的相变，并将使用潜在的skyrmion为基础的微波应用。
The static and dynamic states of Neel skyrmions in ultrathin ferromagnetic films with interfacial Dzyaloshinskii-Moriya interaction (DMI) have been micromagnetically simulated as functions of the interfacial DMI strength and applied static magnetic field. Findings reveal that while the breathing, counterclockwise (CCW) and clockwise (CW) rotational eigenmodes exist in the skyrmion lattice (SkL) phase, only the first two modes are present in the isolated skyrmion (ISk) phase. Additionally, the eigenfrequency of the CCW mode is insensitive to the magnetic-field driven SkL−ISk phase transition, and the inter-skyrmion interaction is largely responsible for exciting the CW mode in the SkL phase. The findings provide physical insight into the dynamics of the phase transition and would be of use to potential skyrmion-based microwave applications.