The 20-nm Skyrmion Generated at Room Temperature by Spin-Orbit Torques

• 作者: Jiahao Liu Zidong Wang Teng Xu Hengan Zhou Le Zhao Soong-Guen Je Mi-Young Im Liang Fang Wanjun Jiang
• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2022,（1）
• 所属期刊栏目: CONDENSED MATTER:ELECTRONIC STRUCTURE,ELECTRICAL,MAGNETIC,AND OPTICAL PROPERTIES
• 页码范围: 54-65
• 页数: 12页
• 语种: 英文
• DOI: 10.1088/0256-307X/39/1/017501

摘要

The discovery of magnetic skyrmions provides a promising pathway for developing functional spintronic memory and logic devices.Towards the future high-density memory application,nanoscale skyrmions with miniaturized diameters,ideally down to 20 nm are required.Using x-ray magnetic circular dichroism transmission microscopy,nanoscale skyrmions are observed in the[Pt/Co/Ir]15 multilayer at room temperature.In particular,small skyrmions with minimum diameters approaching 20 nm could be generated by the current-induced spin-orbit torques.Through implementing material specific parameters,the dynamic process of skyrmion generation is further investigated by performing micromagnetic simulations.According to the simulation results,we find that both the tube-like Néel-type skyrmions and the bobber-like Néel-type skyrmions can be electrically generated.In particular,the size of the bobber-like Néel-type skyrmions can be effectively reduced by the spin-orbit torques,which leads to the formation of 20 nm Néel-type skyrmions.Our findings could be important for understanding the formation dynamics of nanoscale Néel-type spin textures,skyrmions and bobber in particular,which could also be useful for promoting nanoscale skyrmionic memories and logic devices.