Li Liyuan, Li Haotian, Zhou Kaiyuan, Xiao Xiao, Chen Lina, Ma Fusheng, Zhang Junran, Wang Lin, Zhang Lei, Liu Ronghua
National Laboratory of Solid State Microstructures, School of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China.
Nano Lett. 2023 Oct 25;23(20):9243-9249. doi: 10.1021/acs.nanolett.3c02031. Epub 2023 Oct 4.
The chiral helimagnet CrNbS hosts various temperature- and magnetic-field-stabilized chiral soliton lattices (CSLs) and corresponding exotic collective spin resonance modes, which make it an ideal candidate for future magnetic storage/memory and magnon-based information processing. While most studies have focused on characterizing various static spin textures in this chiral helimagnet, its corresponding collective dynamics have rarely been explored. This study systematically investigates the temperature- and magnetic-field-dependent magnetic dynamics of a single crystal of CrNbS using broadband microwave spectroscopy. We observe an optical mode with a temperature-independent mode number in addition to Kittel-like ferromagnetic resonance (FMR) modes in the CSL phase, consistent with the temperature-independent normalized CSL period ()/(0) based on the 1D chiral sine-Gordon model. Furthermore, combining theoretical model fitting and micromagnetic simulation, we provide a detailed phase diagram and temporal-spatial resolution of dynamic modes, which may help to develop high-frequency exchange-coupling-based spintronic devices.
手性螺旋磁体CrNbS拥有各种温度和磁场稳定的手性孤子晶格（CSL）以及相应的奇异集体自旋共振模式，这使其成为未来磁存储/记忆和基于磁振子的信息处理的理想候选材料。虽然大多数研究都集中在表征这种手性螺旋磁体中的各种静态自旋纹理，但其相应的集体动力学却很少被探索。本研究使用宽带微波光谱系统地研究了CrNbS单晶的温度和磁场依赖性磁动力学。我们在CSL相中除了观察到类似基特尔的铁磁共振（FMR）模式外，还观察到一种模式数与温度无关的光学模式，这与基于一维手性正弦-戈登模型的与温度无关的归一化CSL周期（）/（0）一致。此外，结合理论模型拟合和微磁模拟，我们提供了详细的相图和动态模式的时空分辨率，这可能有助于开发基于高频交换耦合的自旋电子器件。
