室温下四方晶系Mn1.9Co0.1Sb单晶中的亚铁磁斯格明子
Ferrimagnetic Skyrmions in a Tetragonal Mn1.9Co0.1Sb Single Crystal at Room Temperature
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中文总结 AI 辅助
研究室温下四方晶系Mn1.9Co0.1Sb单晶中亚铁磁斯格明子，利用洛伦兹透射电子显微镜和微磁模拟，发现其磁行为及演化机制，确定固有频率可达太赫兹量级，为开发新型自旋电子器件开辟新途径。
中文摘要 AI 辅助
室温下小型亚铁磁斯格明子材料的发展对拓扑自旋电子器件应用具有重要意义。四方晶系Mn1.9Co0.1Sb晶体作为室温亚铁磁材料，展现出包括自旋重取向转变在内的多个相变。然而，其磁相变过程中的磁自旋纹理及其演化机制尚不明晰。利用洛伦兹透射电子显微镜，发现并验证了室温下的偶极斯格明子行为及其磁演化。建立了磁纹理随温度和磁场变化的稳定相图，研究了自旋纹理在多个温度诱导磁相变中的演化机制。通过微磁模拟，建立了面内铁磁耦合和层间反铁磁排列的亚铁磁构型。确定由于强层间反平行交换相互作用，亚铁磁斯格明子的固有频率可达太赫兹量级。这些发现凸显了Mn1.9Co0.1Sb中室温亚铁磁斯格明子调控行为的多样性及其动态演化特性，为开发具有增强功能且能在环境条件下运行的新型自旋电子器件开辟了新途径。
英文摘要
The development of room temperature small-sized ferrimagnetic skyrmion materials is significant for topological spintronic device applications. As a room temperature ferrimagnetic material, the tetragonal Mn1.9Co0.1Sb crystal exhibits multiple phase transitions, including spin reorientation transitions. However, the magnetic spin textures and their evolution mechanisms during magnetic phase transitions in Mn1.9Co0.1Sb crystals remain unexplored. Using Lorentz transmission electron microscopy, we discovered and verified dipolar skyrmion behavior and its magnetic evolution at room temperature. We established a stable phase diagram of magnetic textures as functions of temperature and magnetic field, while also investigating the evolution mechanisms of spin textures across multiple temperature-induced magnetic phase transitions. Through micromagnetic simulations, a ferrimagnetic configuration with in-plane ferromagnetic coupling and interlayer antiferromagnetic arrangement was established, which stands in contrast to synthetic ferrimagnetic/antiferromagnetic systems that exhibit interlayer antiferromagnetic coupling via the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction. We determined that the intrinsic frequency of ferrimagnetic skyrmions can reach the THz regime due to strong interlayer antiparallel exchange interactions. These findings highlight the diversity of room temperature ferrimagnetic skyrmion regulation behaviors in Mn1.9Co0.1Sb and their dynamic evolution characteristics, opening new avenues for developing novel spintronic devices with enhanced functionalities capable of operating under ambient conditions.
