具有与共线自旋相关的极化、平衡态为摆线结构的反铁磁多铁性材料的介电响应
Dielectric response of the antiferromagnetic multiferroics with cycloidal equilibrium for the polarization related to the noncollinear spins
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中文总结 AI 辅助
本文解析研究反铁磁多铁性材料在摆线平衡态下的介电响应，揭示自旋起源极化对动力学的影响，并阐明弱铁磁性及无间隙自旋波的关键贡献。
中文摘要 AI 辅助
本文解析研究了反铁磁多铁性材料中小振幅扰动的线性动力学。在所考虑的体系中，平衡态被假定为反铁磁矢量和非零磁化矢量（体系中包含弱铁磁性）均呈摆线结构。考虑了与“非共线”自旋相关的自旋起源电极化，并将其对自旋动力学的影响纳入分析。得到了动态电极化率张量，以展示多铁性材料对交变电场的响应。发现存在两个极化投影，分别给出了它们对垂直于摆线方向的两个电场分量的响应。解析证明了面内与面外电扰动所起的不同作用。描述了低频无间隙自旋波在介电响应中的关键作用。具体指出了螺旋结构与弱铁磁性对介电响应的贡献。
英文摘要
Linear dynamics of the small amplitude perturbations in the antiferromagnetic multiferroics is analytically considered. Equilibrium state in the considered regime is assumed to be cycloidal structure both for the antiferromagnetic vector and the nonzero magnetization vector (presence of weak ferromagnetism in the system is included). The electric polarization of spin origin related to the "noncollinear" spins is considered and its influence on the spin dynamics is included. The dynamical electric susceptibility tensor is obtained to demonstrate response of the multiferroics on the alternating electric field. Existence of two polarization projections is found, response of each of them on two projections of the electric field perpendicular to the cycloid direction is presented. Different roles of the in plane and out of plane electric perturbations is demonstrated analytically. Essential role of the low frequency gapless spin wave in the dielectric response is described. Contributions of the spiral structure and the weak ferromagnetism in the dielectric response are specified.
发表机构
- Lomonosov Moscow State University（莫斯科国立罗蒙诺索夫大学）
机构由 AI 辅助整理，请以论文原文为准。
