Magnetoresistance sensors with CoCr ferromagnetic films

IF 2.5 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials Pub Date : 2025-07-09 DOI:10.1016/j.jmmm.2025.173314

Mingbo Chen , Yichao Zhou , Weibin Chen , Zhengren Yan , Kai Chen , Huizhen Wu , Tiejun Zhou , Shikun He , Changqiu Yu

引用次数: 0

Abstract

The magnetic properties of CoCr thin films are studied for the enhancement of the sensitivity of Z-axis tunneling magnetoresistance sensors. We demonstrate that the CoCr film achieves a low saturation magnetization of 45 emu/cm³ at a Cr concentration of 35 at.%, while maintaining thermal stability up to 400 °C. Incorporating this soft ferromagnetic layer into the magnetic free layer allows significant reduction of the anisotropy field, consistent with the simulated results. Spin valves employing CoCr films were fabricated and giant magnetoresistance was measured. It is revealed that the Co/CoCr composite free layer exhibits twice the sensitivity of a pure Co free layer. These findings highlight the potential of CoFeB/CoCr-based structures for improving the sensitivity of magnetoresistance sensors.

查看原文本刊更多论文

CoCr铁磁薄膜磁阻传感器

为了提高z轴隧穿磁阻传感器的灵敏度，研究了CoCr薄膜的磁性能。我们证明，在Cr浓度为35 at时，CoCr膜达到了45 emu/cm3的低饱和磁化。%，同时保持高达400°C的热稳定性。将软铁磁层纳入磁性自由层，可以显著降低各向异性场，与模拟结果一致。采用CoCr薄膜制备了自旋阀，并测量了巨磁电阻。结果表明，Co/CoCr复合无钴层的灵敏度是纯无钴层的两倍。这些发现突出了CoFeB/ cocr基结构在提高磁阻传感器灵敏度方面的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

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.