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arXiv 2103.14527cond-mat.mes-hallcond-mat.mtrl-scicond-mat.other
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薄膜多层膜中混合和纯Néel Skyrmions的磁化强度特性

Magnetization Reversal Signatures of Hybrid and Pure Néel Skyrmions in Thin Film Multilayers

Nghiep Khoan Duong, Riccardo Tomasello, M. Raju, Alexander P. Petrović, Stefano Chiappini, Giovanni Finocchio, Christos Panagopoulos

摘要:

我们报告了两个系统中的磁化反转和skyrmion配置的研究- Pt/Co/MgO和Ir/Fe/Co/Pt多层膜,其中磁skyrmion通过偶极和Dzyaloshinskiii-Moriya相互作用的组合来稳定(图1)。一阶反射曲线(FORC)图的低介电常数的Pt/Co/MgO和高介电常数的Ir/Fe/Co/Pt表现出明显的差异,这是由微磁模拟确定为指示混合和纯Néel skyrmions,分别。跟踪的演变与偶极相互作用和多层膜中的FORC功能,我们发现,负FORC谷,通常伴随着正FORC峰接近饱和,消失在两个减少偶极相互作用和增强双极性。由于这些条件有利于纯Neel skyrmions的形成,我们提出,由此产生的FORC功能-一个单一的正FORC峰接近饱和-可以作为一个指纹的纯Neel skyrmions在多层膜。因此,我们的研究扩大了效用的FORC分析作为一种工具,用于表征自旋拓扑结构的多层薄膜。

英文摘要:

We report a study of the magnetization reversals and skyrmion configurations in two systems - Pt/Co/MgO and Ir/Fe/Co/Pt multilayers, where magnetic skyrmions are stabilized by a combination of dipolar and Dzyaloshinskii-Moriya interactions (DMI). First Order Reversal Curve (FORC) diagrams of low-DMI Pt/Co/MgO and high-DMI Ir/Fe/Co/Pt exhibit stark differences, which are identified by micromagnetic simulations to be indicative of hybrid and pure Néel skyrmions, respectively. Tracking the evolution of FORC features in multilayers with dipolar interactions and DMI, we find that the negative FORC valley, typically accompanying the positive FORC peak near saturation, disappears under both reduced dipolar interactions and enhanced DMI. As these conditions favor the formation of pure Neel skyrmions, we propose that the resultant FORC feature - a single positive FORC peak near saturation - can act as a fingerprint for pure Néel skyrmions in multilayers. Our study thus expands on the utility of FORC analysis as a tool for characterizing spin topology in multilayer thin films.

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