Surface twist instabilities and skyrmion states in chiral ferromagnets
Surface twist instabilities and skyrmion states in chiral ferromagnets
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DOI：
10.1103/physrevb.90.014406
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发表时间：
2014-07-09
影响因子：
3.7
通讯作者：
Monchesky, T. L.
中科院分区：
文献类型：
--
作者：
Meynell, S. A.;Wilson, M. N.;Monchesky, T. L.
在外延MnSi/Si（111）膜中，由于形成具有垂直于膜表面的传播方向的特定表面手性调制，从未达到面内磁化饱和[Wilson等人，Phys. Rev. B 88，214420（2013）]。在本文中，我们表明，这种手征表面扭曲的发生是一个普遍的效果，由于所有的散装和限制磁性晶体缺乏反演对称性。我们在标准唯象模型内的详细理论分析的支持下，对MnSi/Si（111）纳米层中的这种现象进行了实验研究。在具有内在或诱导手性的磁性纳米层中，这种表面诱导的不稳定性成为相当大的影响，并在skyrmion晶格和其他非平凡手性调制的形成中起着至关重要的作用。
In epitaxial MnSi/Si(111) films, the in-plane magnetization saturation is never reached due to the formation of specific surface chiral modulations with the propagation direction perpendicular to the film surfaces [Wilson et al., Phys. Rev. B 88, 214420 (2013)]. In this paper we show that the occurrence of such chiral surface twists is a general effect attributed to all bulk and confined magnetic crystals lacking inversion symmetry. We present experimental investigations of this phenomenon in nanolayers of MnSi/Si(111) supported by detailed theoretical analysis within the standard phenomenological model. In magnetic nanolayers with intrinsic or induced chirality, such surface induced instabilities become sizable effects and play a crucial role in the formation of skyrmion lattices and other nontrivial chiral modulations.