论文标题
第二谐波响应是一种在磁性节点线半份fe $ _3 $ gete $ _2 $中检测旋转纹理的工具
Second-harmonic response as a tool to detect spin textures in magnetic nodal-line semimetal Fe$_3$GeTe$_2$
论文作者
论文摘要
我们通过实验研究了磁性节点线半份Fe $ _3 $ gete $ _2 $的第二次谐波横向电压响应对交流电流的第二次谐波响应。对于零磁场，观察到的响应取决于纵向电流的平方，因为非线性霍尔效应应预期。发现磁场行为是复杂的：虽然第一谐波响应显示了FGT中已知的异常霍尔滞后时期，但第二谐波的霍尔电压的特征是明显的高场滞后和平坦（$ b $ nontimented的）区域，其曲线在低场上接触。高场磁滞在很大程度上取决于磁场的扫描速率，因此它反映了一些缓慢的松弛过程。对于最低的速率，它也是通过多个跨点来完成的。在非线性光学元件中以天气旋转纹理而闻名第二谐波滞后的类似形状。由于已经通过直接可视化技术证明了FGT的天际缘，因此我们可以将观察到的高场弛豫与天际晶格的变形联系起来。因此，可以将第二谐波霍尔电压响应视为检测运输实验中自旋纹理的工具。
We experimentally investigate second-harmonic transverse voltage response to ac electrical current for a magnetic nodal-line semimetal Fe$_3$GeTe$_2$. For zero magnetic field, the observed response depends as a square of the longitudinal current, as it should be expected for non-linear Hall effect. The magnetic field behavior is found to be sophisticated: while the first-harmonic response shows the known anomalous Hall hysteresis in FGT, the second-harmonic Hall voltage is characterized by the pronounced high-field hysteresis and flat ($B$-independent) region with curves touching at low fields. The high-field hysteresis strongly depends on the magnetic field sweep rate, so it reflects some slow relaxation process. For the lowest rates, it is also accomplished by multiple crossing points. Similar shape of the second-harmonic hysteresis is known for skyrmion spin textures in non-linear optics. Since skyrmions have been demonstrated for FGT by direct visualization techniques, we can connect the observed high-field relaxation with deformation of the skyrmion lattice. Thus, the second-harmonic Hall voltage response can be regarded as a tool to detect spin textures in transport experiments.
