Effect of oxygen pressure during synthesis on the elemental composition, crystal structure, and ferromagnetic resonance spectra of NiFe2O4+δ crystals

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

Journal of Magnetism and Magnetic Materials Pub Date : 2025-09-20 DOI:10.1016/j.jmmm.2025.173521

Anton Matasov , David Gabrielyan , Maxim Sysoev , Oleg Glaz , Dmitry Volkov , Kristina Samoylenko , Kirill Kachurin , Ansar Safin , Sergey Nikitov

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Abstract

The synthesis of NiFe₂O_4+δ crystals under varying oxygen pressures has been systematically investigated to understand their impact on elemental composition, crystal structure, and ferromagnetic resonance spectra. Using the optical floating zone melting technique, bulk single crystals were grown under oxygen pressures of 15, 20, and 30 MPa, followed by annealing in air to achieve different oxygen stoichiometries. X-ray diffraction analysis revealed a cubic crystal structure with lattice parameters influenced by oxygen intercalation, while energy-dispersive X-ray spectroscopy confirmed variations in Fe/Ni ratios, indicating the presence of excess oxygen. Ferromagnetic resonance (FMR) spectra showed tunable resonance frequencies between 5 and 15 GHz under applied magnetic fields, with optimal properties observed for samples synthesized at 15 MPa and annealed for 24 h. These samples exhibited the narrowest FMR linewidth (295 Oe) and the highest absorption intensity, making them promising candidates for spintronic applications such as filters and detectors.

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合成过程中氧压对NiFe2O4+δ晶体元素组成、晶体结构和铁磁共振谱的影响

系统地研究了不同氧压下NiFe2O4+δ晶体的合成，以了解它们对元素组成、晶体结构和铁磁共振谱的影响。利用光学浮区熔融技术，在15、20和30 MPa的氧气压力下生长大块单晶，然后在空气中退火以获得不同的氧化学计量。x射线衍射分析揭示了立方晶体结构，其晶格参数受到氧嵌入的影响，而能量色散x射线光谱证实了Fe/Ni比的变化，表明存在过量的氧。铁磁共振（FMR）光谱显示，在外加磁场下，其共振频率在5至15 GHz之间可调，在15 MPa下合成并退火24小时的样品具有最佳性能。这些样品具有最窄的FMR线宽（295 Oe）和最高的吸收强度，使其成为自旋电子应用（如滤波器和检测器）的有希望的候选者。

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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.