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) Ultrafast demgnetization curves for Co film with various damping constants.