Skyrmion-Bubble Bundles in an X-Type Sr2Co2Fe28O46 Hexaferrite above Room Temperature,Advanced Materials

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Skyrmion-Bubble Bundles in an X-Type Sr2Co2Fe28O46 Hexaferrite above Room Temperature
Advanced Materials ( IF 27.4 ) Pub Date : 2023-09-05 , DOI: 10.1002/adma.202306117
Jin Tang _{1,

2} , Yaodong Wu ₃ , Jialiang Jiang ₂ , Lingyao Kong ₁ , Shouguo Wang ₄ , Mingliang Tian _{1,

2} , Haifeng Du ₂

Affiliation

Magnetic skyrmions are spin swirls that possess topological nontriviality and are considered particle-like entities. They are distinguished by an integer topological charge Q. The presence of skyrmion bundles provides an opportunity to explore the range of values for Q, which is crucial for the advancement of topological spintronic devices with multi-Q properties. In this study, a new material candidate, Sr₂Co₂Fe₂₈O₄₆ hexaferrite of the X-type, which hosts small dipolar skyrmions at room temperature and above is presented. By exploiting reversed magnetic fields from metastable skyrmion bubbles at zero fields, skyrmion-bubble bundles with different interior skyrmion/bubble numbers, topological charges, and morphologies at room temperature are incorporated. These experimental findings are consistently supported by micromagnetic simulations. These results highlight the versatility of topological spin textures in centrosymmetric uniaxial magnets, thereby paving the way for the development of room-temperature topological spintronic devices with multi-Q characteristics.

中文翻译：

室温以上 X 型 Sr2Co2Fe28O46 六角铁氧体中的斯格明子气泡束

磁性斯格明子是具有拓扑非平凡性的自旋漩涡，被认为是类粒子实体。它们通过整数拓扑电荷Q来区分。斯格明子束的存在提供了探索Q值范围的机会，这对于发展具有多Q特性的拓扑自旋电子器件至关重要。在这项研究中，提出了一种新的候选材料，即X型Sr ₂ Co ₂ Fe ₂₈ O _{46六方铁氧体，它在室温及以上温度下具有小型偶极斯格明子。}通过利用零场下亚稳态斯格明子气泡的反向磁场，可以合并具有不同内部斯格明子/气泡数、拓扑电荷和室温形态的斯格明子气泡束。这些实验结果得到了微磁模拟的一致支持。这些结果凸显了中心对称单轴磁体中拓扑自旋织构的多功能性，从而为开发具有多Q特性的室温拓扑自旋电子器件铺平了道路。

更新日期：2023-09-05

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