Interfacial effect on the reverse of magnetization and ultrafast demagnetization in Co/Ni bilayers with perpendicular magnetic anisotropy

Gong Zi-Zhao^{1, 2}, Zhang Wei^{2, 3}, He Wei², Zhang Xiang-Qun², Liu Yong^{1, †}, Cheng Zhao-Hua^{2, 3, ‡}

(color online) 3D evolution of the magnetic moments calculated by OOMMF for Co/Ni bilayers: (a) before coercivity with , (b) after coercivity with , (c) before coercivity with , (d) after coercivity with .