Manipulating magnetic anisotropy and ultrafast spin dynamics of magnetic nanostructures*
Cheng Zhao-Hua†, He Wei, Zhang Xiang-Qun, Sun Da-Li, Du Hai-Feng, Wu Qiong, Ye Jun, Fang Ya-Peng, Liu Hao-Liang
       
Normalized magnetic torque curves. (a) Normalized magnetic torque curves superposed by the first- and the second-order magnetocrystalline anisotropies and uniaxial anisotropy at different fields and (b) the normalized torque contributed only by the first- and the second-order magnetocrystalline anisotropies at field of 2 mT; the solid lines are fitting curves. For comparison, the normalized magnetic torque curves are also plotted in panel (a).[ 70 ]