论文标题
中心对称晶格中铁磁skyrmion崩溃的动力学
Dynamics of the collapse of a ferromagnetic skyrmion in a centrosymmetric lattice
论文作者
论文摘要
在平方晶格上具有磁场的磁场中的铁磁skyrmion的大小和手性的时间依赖性已经进行了分析和数值研究。晶格和磁场产生了Skyrmion手性的强烈时间依赖性。由于非线性，单独的晶格还会产生强大的内在阻尼，从而通过自旋波的发射导致天空塌陷。在没有磁场的情况下，对于大型的天空，塌陷速度很慢，但是在磁场打开时，在Landau-Lifshitz的存在下，它的崩溃呈指数速度。由于天空磁矩的量化，由于崩溃的天空发射的镁必须具有离散的光谱。
Time dependence of the size and chirality of a ferromagnetic skyrmion in a Heisenberg model with the magnetic field on a square lattice has been studied analytically and numerically. The lattice and the magnetic field generate strong time dependence of the skyrmion chirality. Due to nonlinearity, the lattice alone also generates strong intrinsic damping that leads to the skyrmion collapse via the emission of spin waves. In the absence of the magnetic field the collapse is slow for a large skyrmion but it becomes exponentially fast in the presence of the Landau-Lifshitz damping when the field is turned on. Magnons emitted by a collapsing skyrmion must have a discrete spectrum due to the quantization of the skyrmion magnetic moment.
