| 报告题目 | Creating an Artificial Two-Dimensional Skyrmion Crystal by Nanopatterning |
| 报告人 | Prof. H. F. Ding (丁海峰) |
| 报告人单位 | National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University |
| 报告时间 | 2013-12-31 |
| 报告地点 | 合肥微尺度物质科学国家实验室九楼会议室 |
| 主办单位 | 合肥微尺度物质科学国家实验室、国际功能材料量子设计中心 |
| 报告介绍 | 报告摘要：
The skyrmion crystal is a new material of current interest. It carries a topological charge and a Berry phase in real space and is anticipated to produce unconventional spin-electronic phenomena, such as the topological Hall effect and to exhibit spectacular dynamic properties. Technologically, skyrmion crystal may be exploited as a new class of spintronic material due to its unusual response to an electric charge current and spin current. A skyrmion crystal typically arises from helical spin structures induced by the Dzyaloshinskii–Moriya (DM) interaction. Experimentally, what has impeded its property exploration is that it is only to be found in few systems and within a narrow temperature and magnetic field range.
In this talk, we present a proposal for a practical design of a 2D skyrmion crystal, which completely by-passing the need for strong (or, indeed, any) DM interaction1. The methodology is demonstrated with micromagnetic simulations and the computed skyrmion number per unit cell. The created skyrmion crystal has a robost working regime including room temperature, much broader than that for DM-driven skyrmion crystals. The method can dramatically widen the scope of the properties exploration and practical applications of the skyrmion crystal. In addition, from a more general point of view, previous experimental and theoretical studies of systems with DM interactions have already shown amply that the DM interaction is not sufficient for the spontaneous formation of a skyrmion crystal all by itself, since many systems with DM interaction do not display skyrmion-crystal self-assembly. Our method demonstrates that the DM interaction is not necessary either.
1、Sun, L. et al. Creating an Artificial Two-Dimensional Skyrmion Crystal by Nanopatterning. Phys. Rev. Lett. 110, 167201 (2013). |
