Stepanova Mariia, Masell Jan, Lysne Erik, Schoenherr Peggy, Köhler Laura, Paulsen Michael, Qaiumzadeh Alireza, Kanazawa Naoya, Rosch Achim, Tokura Yoshinori, Brataas Arne, Garst Markus, Meier Dennis
Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU), Trondheim 7491, Norway.
Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology (NTNU), Trondheim 7491, Norway.
Nano Lett. 2022 Jan 12;22(1):14-21. doi: 10.1021/acs.nanolett.1c02723. Epub 2021 Dec 22.
Topologically nontrivial spin textures, such as skyrmions and dislocations, display emergent electrodynamics and can be moved by spin currents over macroscopic distances. These unique properties and their nanoscale size make them excellent candidates for the development of next-generation race-track memory and unconventional computing. A major challenge for these applications and the investigation of nanoscale magnetic structures in general is the realization of suitable detection schemes. We study magnetic disclinations, dislocations, and domain walls in FeGe and reveal pronounced responses that distinguish them from the helimagnetic background. A combination of magnetic force microscopy (MFM) and micromagnetic simulations links the response to the local magnetic susceptibility, that is, characteristic changes in the spin texture driven by the MFM tip. On the basis of the findings, which we explain using nonlinear response theory, we propose a read-out scheme using superconducting microcoils, presenting an innovative approach for detecting topological spin textures and domain walls in device-relevant geometries.
拓扑非平凡自旋纹理，如斯格明子和位错，表现出新兴的电动力学特性，并且可以通过自旋电流在宏观距离上移动。这些独特的性质及其纳米级尺寸使其成为下一代赛道存储器和非常规计算发展的理想候选者。对于这些应用以及一般的纳米级磁性结构研究而言，一个主要挑战是实现合适的检测方案。我们研究了FeGe中的磁旋错、位错和畴壁，并揭示了将它们与螺旋磁背景区分开来的明显响应。磁力显微镜（MFM）和微磁模拟相结合，将这种响应与局部磁化率联系起来，即由MFM针尖驱动的自旋纹理的特征变化。基于我们使用非线性响应理论解释的这些发现，我们提出了一种使用超导微线圈的读出方案，为在与器件相关的几何结构中检测拓扑自旋纹理和畴壁提供了一种创新方法。
