Magnetic skyrmions in chiral multilayers

手性多层膜中的磁性斯格明子

• 批准号: 2752169
• 金额: --
• 依托单位: University of Leeds
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2752169
• 关键词: Magnetic; skyrmions; chiral; multilayers

In this project we will study magnetic skyrmions, nanoscale swirls of spins that possess a non-trivial topology. They appear in properly designed magnetic multilayers at room temperature and are candidates for next-generation data storage technology. It is now over a decade since the carbon footprint of the internet grew larger than that of commercial air travel, much of this energy is used to physically spin hard disks, write data to them, and write and refresh volatile memory. To drive skyrmions along a crystal using spin torque requires several orders of magnitude less current density then driving magnetic domains under ideal conditions, but this is not seen in practice in these systems so far. Magnetic skyrmions offer the prospect of vastly reducing the energy needed to write and store digital data if their properties can be controlled.The proposed focus of this project is the mobility of skyrmions at room temperature under the influence of enhanced spin-orbit torques provided by placing the skyrmion-bearing multilayer on top of another material with suitable properties. The student will grow the heterostructures, characterise them structurally and magnetically, and then pattern them into nanoscale devices in which the high current densities needed to generate spin-torques can be achieved with reasonable currents. Skyrmion nucleation and motion will then be studied by means of magnetic imaging.

在这个项目中，我们将研究磁性Skyrmions，即具有非平凡拓扑结构的纳米级自旋。它们在室温下出现在经过适当设计的磁性多层膜中，是下一代数据存储技术的候选者。现在距离互联网的碳足迹超过商业航空旅行已经过去了十多年，其中大部分能源被用于物理旋转硬盘，向硬盘写入数据，以及写入和刷新易失性存储器。使用自旋扭矩驱动Skyrmions沿晶体运动需要比理想条件下驱动磁畴的电流密度低几个数量级，但到目前为止，这在这些系统中还没有实际应用。磁天幕子提供了极大地减少写入和存储数字数据所需的能量的前景，如果它们的性质可以控制的话。该项目的拟议的重点是在室温下，通过将天幕子的多层膜放置在另一种具有合适性质的材料上而提供的增强的自旋轨道力矩的影响下，天幕子的迁移率。学生将生长异质结构，从结构和磁性上对它们进行表征，然后将它们制成纳米级器件，在这些器件中，可以通过合理的电流实现产生自旋扭矩所需的高电流密度。然后，我们将用磁成象的方法来研究摩天星的成核和运动。