Bruno L.D. Santos , Alisson C. Krohling , Klaus Krambrock , Edson C. Passamani , Waldemar A.A. Macedo
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引用次数: 0
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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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.
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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.
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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.
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