Creation and annihilation of topological meron pairs in in-plane magnetized films.,Nature Communications

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Creation and annihilation of topological meron pairs in in-plane magnetized films.
Nature Communications ( IF 14.7 ) Pub Date : 2019-12-06 , DOI: 10.1038/s41467-019-13642-z
N Gao _{1,

2} , S -G Je ₃ , M -Y Im _{3,

4} , J W Choi ₅ , M Yang ₂ , Q Li ₂ , T Y Wang ₂ , S Lee ₆ , H -S Han ₆ , K -S Lee ₆ , W Chao ₃ , C Hwang ₇ , J Li ₈ , Z Q Qiu ₂

Affiliation

Merons which are topologically equivalent to one-half of skyrmions can exist only in pairs or groups in two-dimensional (2D) ferromagnetic (FM) systems. The recent discovery of meron lattice in chiral magnet Co8Zn9Mn3 raises the immediate challenging question that whether a single meron pair, which is the most fundamental topological structure in any 2D meron systems, can be created and stabilized in a continuous FM film? Utilizing winding number conservation, we develop a new method to create and stabilize a single pair of merons in a continuous Py film by local vortex imprinting from a Co disk. By observing the created meron pair directly within a magnetic field, we determine its topological structure unambiguously and explore the topological effect in its creation and annihilation processes. Our work opens a pathway towards developing and controlling topological structures in general magnetic systems without the restriction of perpendicular anisotropy and Dzyaloshinskii-Moriya interaction.

中文翻译：

平面磁化膜中拓扑瓜对的产生和an灭。

在拓扑上等同于一半的天蝎子的瓜子在二维（2D）铁磁（FM）系统中只能成对或成组存在。最近在手性磁体Co8Zn9Mn3中发现了铁素体晶格，提出了一个紧迫的挑战性问题：是否可以在连续的FM薄膜中创建并稳定单个的铁素体对（它是任何二维铁素体系统中最基本的拓扑结构）？利用绕组数守恒，我们开发了一种新方法，可以通过从Co盘上进行局部涡旋压印来在连续的Py薄膜中创建和稳定一对瓜子。通过直接在磁场中观察所创建的瓜对，我们可以明确确定其拓扑结构，并探索其创建和an灭过程中的拓扑效应。

更新日期：2019-12-06

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