论文标题
直接可视化和控制抗铁磁域和父基层中的自旋重新定位
Direct visualization and control of antiferromagnetic domains and spin reorientation in a parent cuprate
论文作者
论文摘要
我们报告了SR $ _2 $ _2 $ _3 $ _3 $ _4 $ cl $ _2 $上的磁性光学第二谐波生成（SHG）偏光仪和成像，它允许直接可视化父母蒸煮酸盐的介质抗fiferromagnetic（AFM）结构。温度和磁场依赖性SHG揭示了大型域，其相对方向的90 $^{\ circ} $通过单轴磁各向异性和地球磁场的组合稳定。低于温度$ t_r $ $ \ sim $ 97 K，我们观察到一个不寻常的90 $^{\ circ} $旋转重新定向过渡，这可能是由两个铜sublattices的竞争磁各向异性驱动的，该转换交换了AFM域状态，同时保留了域结构。这允许通过热或激光加热对AFM状态进行确定性切换。接近$ t_r $，域壁变得异常响应于施加的磁场，地球场足以将其完全排出晶体。我们的发现释放了研究家长酸奶的介观AFM行为的机会，并探索了其对AFM技术的潜力。
We report magnetic optical second-harmonic generation (SHG) polarimetry and imaging on Sr$_2$Cu$_3$O$_4$Cl$_2$, which allows direct visualization of the mesoscopic antiferromagnetic (AFM) structure of a parent cuprate. Temperature- and magnetic-field-dependent SHG reveals large domains with 90$^{\circ}$ relative orientations that are stabilized by a combination of uniaxial magnetic anisotropy and the Earth's magnetic field. Below a temperature $T_R$ $\sim$ 97 K, we observe an unusual 90$^{\circ}$ spin reorientation transition, possibly driven by competing magnetic anisotropies of the two copper sublattices, which swaps the AFM domain states while preserving the domain structure. This allows deterministic switching of the AFM states by thermal or laser heating. Near $T_R$, the domain walls become exceptionally responsive to an applied magnetic field, with the Earth's field sufficient to completely expel them from the crystal. Our findings unlock opportunities to study the mesoscopic AFM behavior of parent cuprates and explore their potential for AFM technologies.
