标题： 铁磁/超导异质结构中的异常涡旋霍尔效应 显示英文标题

标题： Anomalous vortex Hall effect in a ferromagnet/superconductor heterostructure

摘要： 超导和铁磁共存是凝聚态物理中一个引人入胜且复杂的现象，因为这两种状态通常由于自旋构型的竞争而互斥。然而，通过邻近效应在这两种序之间的相互作用一直是研究的热点，因为它为新型技术应用开辟了可能性。 在这里，我们报告了在由面向靶材溅射生长的超导 {\delta }-TaN/铁磁 CoFeB 异质结构中观察到的超导和铁磁共存现象。全面研究了超导态，并发现了超导和铁磁序参量之间存在强相关性的证据。 特别是，在接近临界温度的超导转变混合状态下，我们在没有外加磁场的情况下观察到了异常霍尔信号。通过改变温度和磁场下霍尔电阻的系统表征，将这种行为归因于涡旋霍尔效应（VHE），即在混合态下，超导涡旋在接近临界温度时发生横向运动。 与之前报道的传统 II 型超导体中的 VHE 不同，TaN 中的异常 VHE 是由底层 CoFeB 层中的杂散场引起的。 强自旋轨道耦合、TaN 层中的超导性以及 CoFeB 层中高度自旋极化的铁磁有序的并发现象，为邻近诱导的涡旋动力学以及新型超导自旋电子器件的设计提供了新的见解。 显示英文摘要

摘要： The coexistence of superconductivity and ferromagnetism is a fascinating and complex phenomenon in condensed matter physics, as these two states are typically mutually exclusive due to their competing spin configurations. However, the interplay between these two orders through the proximity effect has been a subject of intense research as it opens up possibilities for novel technological applications. Here, we report the coexistence of superconductivity and ferromagnetism in superconducting {\delta}-TaN/ferromagnetic CoFeB heterostructures grown by facing-target sputtering. Superconducting states are comprehensively investigated, with evidence of strong correlation between the superconducting and ferromagnetic order parameters. In particular, we observed an anomalous Hall signal without the presence of the magnetic field in the mixed state of the superconducting transition near the critical temperature. Systematic characterizations of the Hall resistance under varying temperatures and magnetic fields attribute this behavior to the vortex Hall effect (VHE), whereby superconducting vortices in the mixed state undergo transverse motions near the critical temperature. Unlike previously reported VHEs in conventional type-II superconductors, the anomalous VHE in TaN is induced by the stray field in the underlying CoFeB layers. The concurrency of strong spin-orbit coupling, the superconductivity in the TaN layer, and the highly spin-polarized ferromagnetic ordering in the CoFeB layer offers new insights into proximity-induced vortex dynamics and the design of novel superconducting spintronic devices.