Nutational switching in ferromagnets and antiferromagnets
Nutational switching in ferromagnets and antiferromagnets
复制标题
铁磁体和反铁磁体的章动转换
DOI：
10.1103/physrevb.106.214403
复制
发表时间：
2022
影响因子：
3.7
通讯作者：
Levente R'ozsa
中科院分区：
文献类型：
--
作者：
Lucas Winter;Sebastian Großenbach;U. Nowak;Levente R'ozsa
最近的研究表明，在超短时间尺度上，磁化动力学不仅表现为进动，而且还表现为章动。在这里，我们研究章动如何有助于自旋转换，导致超快的数据写入。我们用解析理论和数值自旋模拟讨论了铁磁和反铁磁体在高频磁fi场中的行为。在铁磁体中，线性极化的fi场垂直于外部fi场对齐磁化，从而实现90◦开关。对于XY平面上的圆极化fi场，磁化强度向z方向倾斜。在倾斜过程中，它绕z轴旋转，允许180◦切换。在反铁磁体中，频率高于章动频率的外部fi场使序参数平行于fi场方向，而对于较低频率的外场则垂直于fi场。开关频率随磁fi场强的增加而增加，并且偏离了拉莫尔频率，这使得在高磁fi场下有可能超过进动开关。
It was demonstrated recently that on ultrashort timescales magnetization dynamics not only exhibits precession but also nutation. Here, we investigate how nutation can contribute to spin switching, leading towards ultrafast data writing. We use analytic theory and numerical spin simulations to discuss the behavior of ferromagnets and antiferromagnets in high-frequency magnetic fields. In ferromagnets, linearly polarized fields align the magnetization perpendicular to the external field, enabling 90 ◦ switching. For circularly polarized fields in the xy plane, the magnetization tilts to the z direction. During this tilting it rotates around the z axis, allowing 180 ◦ switching. In antiferromagnets, external fields with frequencies higher than the nutation frequency align the order parameter parallel to the field direction, while for lower frequencies it is oriented perpendicular to the field. The switching frequency increases with the magnetic field strength, and it deviates from the Larmor frequency, making it possible to outpace precessional switching in high magnetic fields.
影响因子：
8.6
作者：
Stanciu, C. D.;Hansteen, F.;Rasing, Th.
通讯作者：
Rasing, Th.