关键词: 铁磁性材料, 磁化动力学, 自旋轨道耦合, 量子绝热捷径技术

Abstract: A fast control protocol for magnetization dynamics of submicron ferromagnetic thin films is proposed. Because of spin-orbit coupling, the spin-polarized current generated by the external electric field induces magnetization rotation in the local magnetic moment of the ferromagnetic layer via s-d exchange coupling. We apply an inverse engineering method, a shortcuts to adiabaticity technique, to flip the magnetization orientation in the submicron ferromagnetic thin films and optimise the intensity of the electric field. We also analyze the control schemes for ferromagnetic thin films with both isotropic and anisotropic shapes. Our proposed protocol can shorten the reversal time of the magnetization vector compared to that of the existing methods by an order of magnitude and exhibits better robustness.

Key words: ferromagnetic material, magnetization dynamics, spin-orbit coupling, short-cuts to adiabaticity