Photoinduced magnetic softening of perpendicularly magnetized L10-FePt granular films
Photoinduced magnetic softening of perpendicularly magnetized L10-FePt granular films
复制标题
DOI：
10.1063/1.3007977
复制
发表时间：
2008-10
影响因子：
4
通讯作者：
Zhiling Xu;Xinyi Liu;R. Gao;Zi-Yu Chen;T. Lai;H. N. Hu;Shuigeng Zhou;X. Bai;J. Du
中科院分区：
文献类型：
--
作者：
Zhiling Xu;Xinyi Liu;R. Gao;Zi-Yu Chen;T. Lai;H. N. Hu;Shuigeng Zhou;X. Bai;J. Du
首次研究了垂直磁化颗粒膜的超快自旋动力学。在飞秒激光作用下，FePt连续膜、FePtMgO和FePtAg颗粒膜的矫顽力Hc和饱和克尔旋转θKs显著降低，反射率R急剧增加，随后这些物理量缓慢恢复。FePt膜、FePtMgO膜和FePtAg膜的Hc、θ、Ks和R的变化都不同。这种差异是由不同的薄膜厚度造成的，特别是由于金属纳米颗粒的表面等离子体共振。
Ultrafast spin dynamics has for the first time been studied in perpendicular magnetized granular films. For FePt continuous films and FePt–MgO and FePt–Ag granular films with femtosecond laser excitations, the coercivity HC and the saturation Kerr rotation θKS are dramatically reduced, accompanied by a sharp increase in the reflectivity R. Afterward, these physical quantities are slowly recovered. The changes in HC, θKS, and R are all different among FePt, FePt–MgO, and FePt–Ag films. The difference is caused by different film thicknesses and in particular by the surface plasmon resonance of metallic nanoparticles.