Quadratic Scaling of Intrinsic Gilbert Damping with Spin-Orbital Coupling in L10 FePdPt Films: Experiments and Ab Initio Calculations
Quadratic Scaling of Intrinsic Gilbert Damping with Spin-Orbital Coupling in L10 FePdPt Films: Experiments and Ab Initio Calculations
复制标题
DOI：
10.1103/physrevlett.110.077203
复制
发表时间：
2013-02-12
影响因子：
8.6
通讯作者：
Zhou, S. M.
中科院分区：
文献类型：
--
作者：
He, P.;Ma, X.;Zhou, S. M.
利用时间分辨磁光克尔效应测量和自旋相关的从头计算方法研究了L1（0）有序FePd 1-xPtx薄膜中内禀吉尔伯特阻尼系数α（0）与自旋轨道耦合强度xi的关系.通过改变Pt/Pd浓度比实现了α（0）在一个以上数量级上的连续调谐，表明α（0）与xi（2）成比例，因为发现其他主要参数的变化可以忽略不计。垂直磁各向异性随x的变化趋势相似。研究结果有助于设计和制备具有大垂直磁各向异性和定制阻尼性能的新型磁性合金。DOI：10.1103/PhysRevLett.110.077203
The dependence of the intrinsic Gilbert damping parameter alpha(0) on the spin-orbital coupling strength xi is investigated in L1(0) ordered FePd1-xPtx films by time-resolved magneto-optical Kerr effect measurements and spin-dependent ab initio calculations. Continuous tuning of alpha(0) over more than one order of magnitude is realized by changing the Pt/Pd concentration ratio showing that alpha(0) is proportional to xi(2) as changes of other leading parameters are found to be negligible. The perpendicular magnetic anisotropy is shown to have a similar variation trend with x. The present results may facilitate the design and fabrication of new magnetic alloys with large perpendicular magnetic anisotropy and tailored damping properties. DOI: 10.1103/PhysRevLett.110.077203