论文标题
非中心抗铁磁铁中的大表面磁化
Large Surface Magnetization in Noncentrosymmetric Antiferromagnets
论文作者
论文摘要
理论上研究了带有rashba旋转轨道耦合的薄膜抗铁磁铁（AFS）。我们证明了相对论的dzyaloshinskii-moriya相互作用（DMI）在抗铁磁N \'EEL载体中产生较大的表面磁化和边界驱动的扭曲状态。我们预测售价为$ 2.3 \ cdot 10^4 $ 〜a/m的磁化，这与铁磁半导体的磁化相当。重要的是，磁化强度的特征是超快速的Terahertz动力学，并提供了有效探测和控制AFS的自旋动力学以及检测抗磁力DMI的新方法。值得注意的是，磁化强度不会导致任何流浪磁场，除了在出现弱磁性单极场的角落。
Thin-film antiferromagnets (AFs) with Rashba spin-orbit coupling are theoretically investigated. We demonstrate that the relativistic Dzyaloshinskii-Moriya interaction (DMI) produces a large surface magnetization and a boundary-driven twist state in the antiferromagnetic N\' eel vector. We predict a magnetization on the order of $2.3\cdot 10^4$~A/m, which is comparable to the magnetization of ferromagnetic semiconductors. Importantly, the magnetization is characterized by ultra-fast terahertz dynamics and provides new approaches for efficiently probing and controlling the spin dynamics of AFs as well as detecting the antiferromagnetic DMI. Notably, the magnetization does not lead to any stray magnetic fields except at corners where weak magnetic monopole fields appear.
