磁斯格明子的可控制备及其超快自旋动力学研究

磁斯格明子是具一种有纳米级自旋拓扑结构的准粒子,它具有尺寸小、受拓扑保护、高稳定性和易操控等特点,在构建未来高密度、高速度、低能耗自旋电子学器件等方面具有潜在的应用价值。到目前为止，对于新型磁性材料纳米结构单元的物性了解也还不充分，具有更高精度、更快响应速度的新型磁结构的探测关键技术问题还有待突破等。本项目拟利用分子束外延生长方法，制备具有高临界温度的磁斯格明子薄膜或多层膜;利用深紫外激光磁光与磁圆二色性谱仪与角分辨光电子谱结合，研究磁斯格明子薄膜或多层膜的电子结构和自旋手性螺旋结构;通过时间分辨磁光效应，阐明晶体非中心对称结构、电子结构、DM相互作用和自旋结构对超快自旋动力学的影响,实现在100fs尺度下的超快磁动力学过程探测。发展对电子结构、自旋结构及手性的超快、超灵敏探测的新手段，实现脉冲激光对磁斯格明子自旋排列的调控，为磁斯格明子在超快自旋电子器件的应用提供理论基础。

Magnetic skyrmions are small swirling topological defects in the magnetization texture. Their stabilization and dynamics depend strongly on their topological properties. Skyrmions can be extremely small, with diameters in the nanometre range, and behave as particles that can be moved. The development of skyrmion-based topological spintronics holds promise for applications in the future. Up to data, there are still many challenges. Furthermore, there are no reports regarding the ultrafast spin dynamics of magnetic skyrmions.. In the project, we will grow magnetic thin films and multilayered skyrmions by means of molecular beam epitaxy. We also investigate the effect of crystal structure, electronic structure and spin structure on the ultrafast magneto-optical effect by using time-resolved magneto-optical Kerr effect (TRMOKE), and deep Ultraviolet laser based magnetic circular dichroism spectrometers(DUV-MCD). We will develop a new technique to probe sensistively ultrafast spin dynamics in timescale of 100 fs. Our work will reveal that the ultrashort laser pulse can open a new avenue to engineer the ultrafast spin dynamics and expand the application of ultrafast skyrmion-based topological spintronic devices.