发表机构
Indian Institute of Technology Kanpur（坎普尔印度理工学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出利用非线性自旋极化实现中心对称交错磁体中Néel序的确定性电学翻转，通过交错响应与SOC诱导横向分量协同作用，实现180°翻转及电学读写方案。
AI 中文摘要
在中心对称交错磁体中，Néel序的确定性电学翻转仍具挑战性，因为线性电流诱导的自旋极化被反演对称性所禁止。在此，我们建立了一条实现Néel序控制的非线性路径。自旋群对称性表明，在非相对论极限下，非线性自旋极化被约束在Néel矢量方向上，且在10个非平凡自旋Laue群中的8个群内允许出现交错响应。尽管这种Néel自旋极化本身不具有扭矩活性，但有限的自旋轨道耦合（SOC）可以产生一个垂直于Néel矢量的额外均匀分量。利用d波交错磁体FeSb$_2$的最小模型，我们证明了非相对论交错响应与SOC诱导的均匀横向分量共存。基于Landau-Lifshitz-Gilbert方程的宏自旋模拟表明，仅横向分量会产生振荡动力学，而它与交错响应的协同作用则能实现确定性的180°翻转。我们进一步表明，改变电场方向会反转交错自旋响应并选择翻转方向，而相反的Néel态可通过其反常霍尔响应加以区分。我们的结果为中心对称交错磁体建立了一种非线性电学写入-读取方案。
英文摘要
Deterministic electrical switching of the Néel order remains challenging in centrosymmetric altermagnets, where linear current-induced spin polarization is forbidden by inversion symmetry. Here, we establish a nonlinear route to Néel order control. Spin group symmetry shows that, in the nonrelativistic limit, the nonlinear spin polarization is constrained along the Néel vector, with a staggered response allowed in $8$ of the $10$ nontrivial spin-Laue groups. Although this Néel spin polarization is torque-inactive by itself, finite spin-orbit coupling can generate an additional uniform component transverse to the Néel vector. Using a minimal model for the $d$-wave altermagnet FeSb$_2$, we demonstrate the coexistence of the nonrelativistic staggered response with an SOC-induced uniform transverse component. Landau-Lifshitz-Gilbert equation-based macro-spin simulations reveal that the transverse component alone produces oscillatory dynamics, whereas its cooperative action with the staggered response enables deterministic $180^\circ$ reversal. We further show that changing the electric field orientation reverses the staggered spin response and selects the switching direction, while the opposite Néel states can be distinguished by their anomalous Hall response. Our results establish a nonlinear electrical write-read scheme for centrosymmetric altermagnets.
Comments5 figures, 1 table. Comments and suggestions are welcome
