Probing exchange bias at the surface of a doped ferrimagnetic insulator
Probing exchange bias at the surface of a doped ferrimagnetic insulator
复制标题
探测掺杂亚铁磁绝缘体表面的交换偏置
DOI：
10.1103/physrevmaterials.5.074409
复制
发表时间：
2021
影响因子：
3.4
通讯作者：
Xiao, John Q.
中科院分区：
文献类型：
--
作者：
Wang, Yang;Wang, Xiao;Clark, Andy T.;Chen, Hang;Cheng, Xuemei M.;Freeland, John W.;Xiao, John Q.
近年来，随着应力诱导垂直磁各向异性、高效自旋-轨道转矩开关和室温拓扑霍尔效应的实现，稀土铁石榴石因其在自旋电子学应用中的潜力而重新受到人们的关注。在这项研究中，我们研究了微米厚的Bi和Ga取代铥铁石榴石（比加：TmIG）的液相外延法生长的磁性。以上的磁化补偿（MC）温度，异常三重滞后观察比加：TmIG/Pt异质结的异常霍尔效应测量。X射线磁圆二色性和能量色散光谱测量揭示其起源作为内部交换偏置（EB）的影响所产生的不均匀性定位在膜的表面。可能取决于EB层的厚度和缺陷实现的差异，观察到两种类型的磁化反转机制，即，Stoner-Wohlfarth型和可逆畴壁运动型。我们的研究结果表明，丰富的亚磁性相存在于石榴石接近MC，这可以通过化学成分工程和方便地探测电输运测量稳健调谐。
With the realization of stress-induced perpendicular magnetic anisotropy, efficient spin-orbit torque switching, and room temperature topological Hall effect, interest in rare earth iron garnets has been revived in recent years for their potential in spintronic applications. In this study, we investigate the magnetic properties of micrometer-thick Bi and Ga substituted thulium iron garnets (BiGa:TmIG) grown by the liquid-phase epitaxy method. Above the magnetization compensation (MC) temperature, anomalous triple hysteresis is observed in BiGa:TmIG/Pt heterostructures by anomalous Hall effect measurements. X-ray magnetic circular dichroism and energy dispersive spectroscopy measurements reveal its origin as an internal exchange bias (EB) effect arising from inhomogeneities localized at the surface of the film. Possibly depending on the difference in thickness and defect realization of the EB layer, two types of magnetization reversal mechanisms, namely, the Stoner-Wohlfarth type and the reversible domain-wall motion type, are observed. Our results show that rich meta-magnetic phases exist in garnets close to MC, which can be robustly tuned by chemical composition engineering and conveniently probed by electrical transport measurements.