标题： 具有倾斜一阶各向异性的垂直磁化Tb/Co多层膜：实验与建模 显示英文标题

标题： Perpendicularly magnetized Tb/Co multilayers featuring tilted uniaxial anisotropy: Experiments and modeling

摘要： 稀土/过渡金属（RE/TM）多层膜具有垂直磁各向异性是自旋电子学应用发展的关键因素。它们的补偿温度取决于稀土和过渡金属厚度的比例，这使得它们能够在保持各向异性的前提下随着温度调节磁性特性，即使在纳米级器件中也是如此。在这项工作中，我们进行了全面的结构表征，并系统地研究了整个铁磁[Tb/Co]$_{\times 5}$多层膜家族的磁性特性，通过改变Tb厚度（范围从0.4纳米到1.25纳米）来实现。 观察到了补偿温度与Tb层厚度呈线性依赖关系。此外，估计出一个单轴各向异性常数为330$\pm$30 kJ/m$^3$，该值接近其他作者报告的数值。另外，我们提出了一种模型以更好地理解磁滞回线的角度依赖性和补偿温度的线性依赖性。 我们提供了强有力的证据表明，为了解释所观察到的特征，特别是平面内回线中的滞后现象，垂直各向异性必须偏离垂直轴。我们的工作推进了对薄RE/TM铁磁薄膜直流磁性特性的理解，这有可能影响涉及这些材料的不同领域。 显示英文摘要

摘要： Rare earth/transition metal (RE/TM) multilayers with perpendicular magnetic anisotropy are key ingredients for the development of spintronic applications. Their compensation temperature depends on the ratio of the thicknesses of rare earth and transition metal, allowing their magnetic properties to be tuned with temperature while maintaining their anisotropy even in nanometer-scale devices. In this work, we performed a thorough structural characterization and systematically investigate the magnetic properties of a whole family of ferrimagnetic [Tb/Co]$_{\times 5}$ multilayers varying the Tb thickness in the range of 0.4 nm - 1.25 nm. A linear dependence of the compensation temperature on the Tb layer thickness was observed. Moreover, a uniaxial anisotropy constant of 330$\pm$30 kJ/m$^3$, which is close to the values reported by other authors, was estimated. Additionally, we proposed a model to gain a better understanding of the angular dependence of the magnetization loops and the linear dependence of the compensation temperature. We present strong evidence demonstrating that the perpendicular anisotropy must be tilted away from the perpendicular axis in order to explain the observed features, particularly the hysteresis in the in-plane loops. Our work advances the understanding of DC magnetic properties in thin RE/TM ferrimagnetic films, which has the potential to impact different fields where these materials are involved.