Identification and manipulation of spin wave polarizations in perpendicularly magnetized synthetic antiferromagnets
Identification and manipulation of spin wave polarizations in perpendicularly magnetized synthetic antiferromagnets
复制标题
垂直磁化合成反铁磁体中自旋波极化的识别和操纵
DOI：
10.1088/1367-2630/ac3556
复制
发表时间：
2021-11
影响因子：
3.3
通讯作者：
Zhang Zongzhi
中科院分区：
文献类型：
--
作者：
Chen Xing;Zheng Cuixiu;Zhang Yu;Zhou Sai;Liu Yaowen;Zhang Zongzhi
层间交换耦合合成反铁磁体（SAF）具有反铁磁体频率高和铁磁体易于检测的优点。在这里，磁激励的研究通过理论分析和微磁模拟的SAF，由两个相同的铁磁层垂直磁各向异性。与常见的同相声模和异相光模不同，利用不同类型的微波磁场可以在零偏场下激发出线偏振或圆偏振的自旋波模。当沿易磁化轴沿着方向施加偏置磁场时，可观察到左手（LH）和右手（RH）极化模式，并且SAF的右手（LH）模式的共振频率随偏置磁场的增加而线性增加（减小），直至达到临界自旋翻转场，这与共线反铁磁体的易磁化轴各向异性相一致.这些模拟结果与理论推导一致，为了解垂直磁化SAF的动态性质本质提供了基础性见解，这可能为自旋电子应用提供新的前景。
Interlayer exchange-coupled synthetic antiferromagnets (SAFs) have the combined advantages of both high frequency of antiferromagnets and easy detection of ferromagnets. Here, magnetic excitations are investigated by theoretical analysis and micromagnetic simulations in SAFs that consist of two identical ferromagnetic layers with perpendicular magnetic anisotropy. Different from the common in-phase acoustic mode and out-of-phase optic mode, linearly or circularly polarized spin wave modes can be excited at zero bias field by using different types of microwave magnetic fields. Once a bias magnetic field is applied along the easy-axis, left-handed (LH) and right-handed (RH) polarization modes are observed, and the resonance frequency of RH (LH) mode of the SAFs increases (decreases) linearly with the increase of bias magnetic fields until a critical spin-flop field is reached, which is in accordance with collinear antiferromagnets with easy-axis anisotropy. These simulation results agree with the theoretical derivation and provide fundamental insight into the nature of dynamic properties of the perpendicularly magnetized SAFs, which may provide new prospects for spintronic applications.