论文标题
激光引起的旋转螺旋中的扭矩
Laser-induced torques in spin spirals
论文作者
论文摘要
我们使用\ textIt {ab-initio}计算研究了具有旋转螺旋磁结构的磁性非共线铁磁体中激光诱导的扭矩。由于旋转螺旋体可用于近似域壁和天空中的磁化梯度，因此我们的方法可用于从多尺度方法中获取此类对象中的激光诱导的扭矩。采用广义的Bloch理论，我们可以有效地获得电子结构。我们采用我们的方法来评估BCC Fe，HCP CO和L $ _ {1} 0 $ FEPT中激光诱导的扭矩。我们发现，这些磁性非共线系统中激光诱导的扭矩可能比相应的磁性共线系统中的数量级大，并且它们都存在于线性和圆形极化光中。该结果表明，由非连接磁性或磁波动驱动的激光诱导的扭矩可能会对超快速磁性的过程产生重大贡献。
We investigate laser-induced torques in magnetically non-collinear ferromagnets with a spin-spiral magnetic structure using \textit{ab-initio} calculations. Since spin-spirals may be used to approximate the magnetization gradients locally in domain walls and skyrmions, our method may be used to obtain the laser-induced torques in such objects from a multiscale approach. Employing the generalized Bloch-theorem we obtain the electronic structure computationally efficiently. We employ our method to assess the laser-induced torques in bcc Fe, hcp Co, and L$_{1}0$ FePt when a spin-spiral magnetic structure is imposed. We find that the laser-induced torques in these magnetically noncollinear systems may be orders of magnitude larger than those in the corresponding magnetically collinear systems and that they exist both for linearly and circularly polarized light. This result suggests that laser-induced torques driven by noncollinear magnetic order or by magnetic fluctuations may contribute significantly to processes in ultrafast magnetism.
