手性磁孤子的调控和自旋动力学研究

手性磁孤子是一种奇异的非共线磁结构，它是自旋按螺旋方式排列形成的“孤子状”“准粒子”磁构型。手性磁孤子可以在材料中运动、传播、形成周期性的磁孤子晶格等，因此在自旋电子学器件方面具有重要的应用价值。手性磁孤子的形成机理、运动传播的自旋动力学机制等尚不清楚，其涉及多种能量（磁交换能、DM作用能、自旋涨落、热涨落等）和多种自由度（自旋、轨道、晶格、电荷等）之间复杂的竞争和平衡，对于凝聚态关联电子体系的研究具有重要物理意义。洛伦兹电镜是研究“准粒子”磁构型和周期性磁结构直接和直观的手段，而磁共振和磁光测量是研究自旋动力学的有效手段。本项目拟通过磁场、电场、压力等手段对手性磁孤子进行调控，借助洛伦兹电镜、磁共振、超快磁光等测量手段，对其磁构型、周期结构、自旋动力学进行研究，揭示其运动传播的规律，阐明其形成的机理，探索该体系中多种能量和多种自由度之间竞争耦合机制，为其在自旋电子学中的应用奠定物理基础。

Chiral magnetic soliton is a non-collinear exotic magnetic configuration, which is a quasi-particle spin-texture with the shape of soliton. The chiral magnetic soliton can move, transmit, and form chiral magnetic soliton lattice in materials, which is of great importance for the application in the spintronics. However, the formation mechanism, the spin dynamics for the motion and transmission are still open, which refers to the complex competition and balance between multiple kinds of energy (magnetic exchange energy, DM interaction, spin fluctuation, and thermal fluctuation) and multiple kinds of degree of freedom (spin, orbit, lattice, and charge). This is of great significance for the study of correlated electrons systems in condensed matter physics. The Lorenz microscope is a direct and intuitive means to study the magnetic configuration of the quasi-particle and periodicity, while the magnetic resonance and magnetic-optical devices are powerful means to investigate the spin-dynamics. This program is designed to study the magnetic configuration, periodicity, and spin-dynamics of the chiral magnetic soliton utilizing the means of Lorentz microscope, magnetic resonance, and ultrafast magnetic-optics through the modulation of external magnetic field, electronic field, and pressure. The performance of this research project is to reveal the transmission and motion laws of the chiral magnetic soliton, clarify its formation mechanism, and supply solid physical basis for its application in spintronics.