Asymmetric isolated skyrmions in polar magnets with easy-plane anisotropy
Asymmetric isolated skyrmions in polar magnets with easy-plane anisotropy
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DOI：
10.1103/physrevb.96.014423
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发表时间：
2017-07-17
影响因子：
3.7
通讯作者：
Kezsmarki, I.
中科院分区：
文献类型：
--
作者：
Leonov, A. O.;Kezsmarki, I.
介绍了一类孤立的磁skyrmions出现在倾斜的铁磁相的极性磁铁与易平面各向异性。这些skyrmions的非对称磁结构与能量密度的复杂模式相关联，其相对于周围状态呈现出正和负渐近性，铁磁矩远离极轴倾斜。相应地，Skyrmion-Skyrmion相互作用具有各向异性特征，并且可以是吸引的或排斥的，这取决于Skyrmion对的相对取向。我们调查这些不对称的skyrmions对椭圆锥状态的稳定性，并按照他们的转变成轴对称skyrmions，当主机相的倾斜铁磁矩减少。我们的理论为孤立的非对称Skyrmions及其嵌入倾斜铁磁相的团簇的实验研究提供了明确的方向。
We introduce a class of isolated magnetic skyrmions emerging within tilted ferromagnetic phases of polar magnets with easy-plane anisotropy. The asymmetric magnetic structure of these skyrmions is associated with an intricate pattern of the energy density, which exhibits positive and negative asymptotics with respect to the surrounding state with a ferromagnetic moment tilted away from the polar axis. Correspondingly, the skyrmion-skyrmion interaction has an anisotropic character and can be either attractive or repulsive depending on the relative orientation of the skyrmion pair. We investigate the stability of these asymmetric skyrmions against the elliptical cone state and follow their transformation into axisymmetric skyrmions, when the tilted ferromagnetic moment of the host phase is reduced. Our theory gives clear directions for experimental studies of isolated asymmetric skyrmions and their clusters embedded in tilted ferromagnetic phases.