论文标题
激光诱导的超快反电磁和垂直磁各向异性减少在CO $ _ {88} $ tb $ _ {12} $带条纹域的薄膜
Laser-induced ultrafast demagnetization and perpendicular magnetic anisotropy reduction in a Co$_{88}$Tb$_{12}$ thin film with stripe domains
论文作者
论文摘要
我们在Co M $ _ {2,3} $ _ {2,3} $和TB O $ _1 $ -EDGES上使用时间分辨X射线谐振磁散射（TR-XRMS），以在不形成co $ _ {88} $ _ {88} $ tb $ _ {12} $ andoy and pratie domains中使用Ultrafast Demagnetization。将飞秒时间的时间与实验的纳米空间分辨率相结合，我们证明了薄膜的平衡自旋纹理仍然没有超时时间尺度上的光泵 - 脉冲（$ <$ 1 PS）的改变。但是，在$ \ simeq $ 4 ps之后，我们观察到了一个重要的域壁扩展的发作，我们将其归因于系统的单轴磁各向异性的降低，这是由于能量传递到晶格。静态温度依赖性磁力测量结果结合了薄膜磁性结构的分析建模证实了这种解释。
We use time-resolved x-ray resonant magnetic scattering (tr-XRMS) at the Co M$_{2,3}$- and Tb O$_1$-edges to study ultrafast demagnetization in an amorphous Co$_{88}$Tb$_{12}$ alloy with stripe domains. Combining the femtosecond temporal with nanometer spatial resolution of our experiment, we demonstrate that the equilibrium spin texture of the thin film remains unaltered by the optical pump-pulse on ultrashort timescales ($<$1 ps). However, after $\simeq$ 4 ps, we observe the onset of a significant domain wall broadening, which we attribute to a reduction of the uniaxial magnetic anisotropy of the system, due to energy transfer to the lattice. Static temperature dependent magnetometry measurements combined with analytical modeling of the magnetic structure of the thin film corroborate this interpretation.
