铁磁性
凝聚态物理
霍尔效应
双层
绝缘体(电)
材料科学
物理
光电子学
电阻率和电导率
化学
磁场
磁化
膜
量子力学
生物化学
作者
Lin Liu,Jianxin Ye,Hui Yang,Liyu Lin,Hongyu An
摘要
Ferrimagnetic insulators (FMIs) are regarded as promising candidates for magnonic devices. Nevertheless, unraveling the origin of anomalous Hall effect (AHE) and tuning AHE in heavy metal (HM)/FMI prove challenging as charges exclusively traverse within the HM. Here, we investigate AHE in a Pt/Gd3Fe5O12 (GdIG) bilayer at various temperatures and observe a signal inversion at 180 K. By varying the thickness of GdIG and Pt, we note that AHE signal inversion occurs in all instances except when the Pt thickness is below 3 nm. Moreover, the monotonic variation in the temperature dependence of the coercive field (Hc) indicates that the inversion of the AHE signal is not correlated with the compensation temperature (Tc). Instead, it is attributed to the competition between spin Hall magnetoresistance (SMR) and the magnetic proximity effect (MPE). Furthermore, the precise control over the AHE inversion has achieved through the application of extra in-plane magnetic fields (Hx). Our study clarifies the origins of the AHE in Pt/FMI bilayers, where the interaction between the SMR and MPE governs the direction and magnitude of the AHE. Furthermore, we showcase the ability to control the inversion of the AHE signal by manipulating the extra Hx.
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