Sublattice alignment and seed layer influence on magnetic hysteresis and Hall effect in Ta(Al)-TbCo-Ta(Al) films

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Magnetism and Magnetic Materials Pub Date : 2025-05-01 Epub Date: 2025-02-24 DOI:10.1016/j.jmmm.2025.172909

Ramesh Chandra Bhatt, Lin-Xiu Ye, Ming-Hsun Tsai, Te-ho Wu

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Abstract

Here, we study the magnetic properties of compositionally varied TbCo films on Ta and Al seed layers. The anomalous Hall effect (AHE) and magnetization hysteresis (MH) results show the sperimagnetic behavior of Tb for both cases. Further, we introduced a vertical composition gradient in TbCo and measured their AHE and MH response. Ta-based film reveals a magnetic compensation temperature range spanning 150–185 K, while the Al-based film maintains Co-dominance down to 150 K; below this threshold, the coercivity surpasses measurable limits. Both films show a wide temperature window around compensation where the coercivity exceeds 30 kOe values. Notably, the Al-based film manifests a two-order magnitude reduction in anomalous Hall resistance compared to its Ta-based counterpart. The results unravel the role of sublattice alignment and the importance of the seed layer, which could be useful for spintronics applications.

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亚晶格排列和种子层对Ta(Al)-TbCo-Ta（Al）薄膜磁滞和霍尔效应的影响

在此，我们研究了不同成分的TbCo薄膜在Ta和Al种子层上的磁性能。反常霍尔效应（AHE）和磁化滞后（MH）结果显示了Tb在两种情况下的超磁行为。此外，我们在TbCo中引入了垂直组成梯度，并测量了它们的AHE和MH响应。ta基薄膜的磁补偿温度范围为150 ~ 185 K，而al基薄膜在150 K以下仍保持共显性；低于这个阈值，矫顽力超过可测量的极限。当矫顽力超过30koe时，两种薄膜在补偿周围都显示出宽的温度窗。值得注意的是，与ta基薄膜相比，al基薄膜的异常霍尔电阻降低了两个数量级。结果揭示了亚晶格排列的作用和种子层的重要性，这对自旋电子学的应用可能是有用的。

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来源期刊

Journal of Magnetism and Magnetic Materials 物理-材料科学：综合

CiteScore

5.30

自引率

11.10%

发文量

1149

审稿时长

59 days

期刊介绍： The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public. Main Categories: Full-length articles: Technically original research documents that report results of value to the communities that comprise the journal audience. The link between chemical, structural and microstructural properties on the one hand and magnetic properties on the other hand are encouraged. In addition to general topics covering all areas of magnetism and magnetic materials, the full-length articles also include three sub-sections, focusing on Nanomagnetism, Spintronics and Applications. The sub-section on Nanomagnetism contains articles on magnetic nanoparticles, nanowires, thin films, 2D materials and other nanoscale magnetic materials and their applications. The sub-section on Spintronics contains articles on magnetoresistance, magnetoimpedance, magneto-optical phenomena, Micro-Electro-Mechanical Systems (MEMS), and other topics related to spin current control and magneto-transport phenomena. The sub-section on Applications display papers that focus on applications of magnetic materials. The applications need to show a connection to magnetism. Review articles: Review articles organize, clarify, and summarize existing major works in the areas covered by the Journal and provide comprehensive citations to the full spectrum of relevant literature.