Generation and stability of dynamical skyrmions and droplet solitons
Generation and stability of dynamical skyrmions and droplet solitons
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DOI：
10.1088/1361-6528/aac411
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发表时间：
2018-03
期刊：
影响因子：
3.5
通讯作者：
N. Statuto;J. Hernàndez;A. Kent;F. Macià
中科院分区：
文献类型：
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作者：
N. Statuto;J. Hernàndez;A. Kent;F. Macià
磁膜纳米接触中的自旋极化电流可以通过补偿磁阻尼来产生集体磁振荡。特别是，在单轴磁各向异性的材料中，液滴孤子已被消除-一个自本地化的激励组成的部分反转的磁化，旋进相干的纳米接触区域。也可以产生拓扑液滴孤子，称为动态skyrmions（DS）。在这里，我们表明，自旋极化电流阈值DS创建不仅取决于材料的参数，但也对初始磁化状态和自旋极化电流的上升时间。我们研究了促进液滴或DS形成的条件，并描述了它们在没有Dzyaloshinskiii-Moriya相互作用的磁性薄膜中的稳定性。来自所施加的电流的奥斯特场、初始磁化状态和注入电流的上升时间可以确定是否形成液滴或DS。发现DS比液滴更稳定。我们还讨论了可用于区分这些磁性物体的电特性。
A spin-polarized current in a nanocontact to a magnetic film can create collective magnetic oscillations by compensating the magnetic damping. In particular, in materials with uniaxial magnetic anisotropy, droplet solitons have been observed—a self-localized excitation consisting of partially reversed magnetization that precesses coherently in the nanocontact region. It is also possible to generate topological droplet solitons, known as dynamical skyrmions (DSs). Here, we show that spin-polarized current thresholds for DS creation depend not only on the material’s parameters but also on the initial magnetization state and the rise time of the spin-polarized current. We study the conditions that promote either droplet or DS formation and describe their stability in magnetic films without Dzyaloshinskii–Moriya interactions. The Oersted fields from the applied current, the initial magnetization state, and the rise time of the injected current can determine whether a droplet or a DS forms. DSs are found to be more stable than droplets. We also discuss electrical characteristics that can be used to distinguish these magnetic objects.