论文标题
铁磁体和抗铁磁铁的坚果转换
Nutational switching in ferromagnets and antiferromagnets
论文作者
论文摘要
最近证明，在超短时间上尺度磁化动力学不仅表现出动力，而且还表现出肉类。在这里，我们调查了养分如何有助于旋转转换导致超快数据写作。我们使用分析理论和原子旋转模拟来讨论高频磁场中的铁磁体和抗铁磁体的行为。在Ferromagnets中，线性两极化的字段将垂直于外部场的磁化对齐，使$ 90^{\ Circ} $ Switching启用。对于$ xy $ plane中的圆两极化磁场，磁化化倾斜到$ z $方向。在此倾斜过程中，它围绕$ z $轴旋转，允许$ 180^{\ circ} $切换。在抗铁磁铁中，频率高于营养频率的外部磁场平行于现场方向的顺序参数，而对于较低的频率，它的定向垂直于磁场。开关频率随着磁场强度的增加而增加，并且它偏离了Larmor频率，从而超过了高磁场中的进型切换。
It was demonstrated recently that on ultrashort time scales magnetization dynamics does not only exhibit precession but also nutation. Here, we investigate how nutation can contribute to spin switching leading towards ultrafast data writing. We use analytic theory and atomistic 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 $90^{\circ}$ 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 $180^{\circ}$ 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.
