Structural and magnetic properties of Co2FeGa full-Heusler alloy thin films with low Gilbert damping

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

Journal of Magnetism and Magnetic Materials Pub Date : 2024-11-30 DOI:10.1016/j.jmmm.2024.172691

Bruno L.D. Santos , Alisson C. Krohling , Klaus Krambrock , Edson C. Passamani , Waldemar A.A. Macedo

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Abstract

Highly ordered Co₂FeGa thin films were successfully prepared using direct current magnetron sputtering by adjusting the film growth conditions. This involved making modifications to substrate and annealing temperatures. Structural, chemical, and magnetic properties were systematically studied using global and surface techniques. The results showed a transition from a partially ordered film grown at 300 °C to a highly ordered L2₁ full-Heusler phase at 600 °C. X-ray photoelectron spectroscopy confirmed a stoichiometric Co₂FeGa alloy for the films, while ⁵⁷Fe conversion electron Mössbauer spectroscopy revealed the atomic disorder–order transition induced by high substrate temperatures and/or annealing temperatures. The magnetic properties were found to be strongly influenced by the thermal history of the films. Saturation magnetization reached 1200 kA/m and coercivity was as low as 0.8 mT for the film growth at 600 °C. Ferromagnetic resonance showed that the α-Gilbert damping parameter was significantly affected by growth conditions with a value of 0.0015(3) measured in films grown at the highest temperature. This study demonstrates that precise control over film crystallinity and atomic ordering can lead to low α-damping values in polycrystalline Co₂FeGa thin films, making them promising materials for use in spintronic devices.

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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.