铁磁薄膜快速稳定的磁化动力学控制  

Fast and robust magnetization dynamics control of ferromagnetic thinfilms

作　　者：李欣和 班玥 LI Xinhe;BAN Yue(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学材料科学与工程学院,上海200444

出　　处：《上海大学学报（自然科学版）》2024年第4期758-768,共11页Journal of Shanghai University:Natural Science Edition

摘　　要：提出了亚微米铁磁薄膜磁化动力学的快速控制方案.由于自旋轨道耦合作用,外加电场所激发的自旋极化电流通过s-d交换耦合引起铁磁层的局域磁矩发生偏转.使用量子绝热捷径技术反控制法在亚微米铁磁薄膜模型中提出了电场控制方案,实现了磁化向量方向快速反转,并对电场强度进行了最优化设计.另外,分析了铁磁薄膜形状各向同性和异性下的电场控制方案.相比于现有方法,该方案将磁化向量反转时间缩短了约一个数量级,并且具有更好的鲁棒性.A fast control protocol for magnetization dynamics of submicron ferromagnetic thinfilms is proposed.Because of spin-orbit coupling,the spin-polarized current generated by the external electricfield 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,toflip the magnetization orientation in the submicron ferromagnetic thinfilms and optimise the intensity of the electricfield.We also analyze the control schemes for ferromagnetic thinfilms 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.

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 

分 类 号：O482.5[理学—固体物理]