论文标题
来自原子旋转动力学的无定形Ferromagnet Co $ _4 $ p的镁光谱
Magnon Spectrum of the Amorphous Ferromagnet Co$_4$P from Atomistic Spin Dynamics
论文作者
论文摘要
在半个世纪前，通常称为“ roton般的”激发，通常被称为“旋转式”的激发，通常称为“ roton般的”激发，这引起了很多关注。随着当前对无定形磁体中热和自旋电流的兴趣，我们采用了现代的模拟方法，将反向蒙特卡洛结合起来，以构建原子结构和随机Landau-lifshitz方程来进行自旋动力学，以重新投资磁激励光谱。我们发现了两个镁谷，一个位于原点，另一个位于有限的波数接近观测的波数，但没有镁质缝隙。我们得出的结论是，第二次倾斜是由于残留的远程顺序引起的umklapp散射，这可能是对假定旋转激发的替代解释。我们的研究铺平了研究无定形磁铁和相关的旋转应用中的磁通运输的方式。
An anomaly in the magnon dispersion of the amorphous ferromagnet Co$_{4}$P, often referred to as a `roton-like' excitation, attracted much attention half a century ago. With the current interest in heat and spin currents in amorphous magnets, we apply modern simulation methods, combining reverse Monte Carlo to build the atomic structure and the stochastic Landau-Lifshitz equation for spin dynamics, to re-investigate the magnetic excitation spectrum. We find two magnon valleys, one at the origin and another at a finite wavenumber close to the observations, but without a magnon gap. We conclude that the second dip is due to Umklapp scattering caused by residual long-range order, which may be an alternative explanation of the putative roton excitation. Our study paves the way to study magnon transport in amorphous magnets and related spintronic applications.
