Effect of applied magnetic field on the complex permeability of polycrystalline Perovskite La0.7Sr0.3-xKxMnO3 (0 ≤ x ≤ 0.15)

IF 2.5 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Magnetism and Magnetic Materials Pub Date : 2025-02-21 DOI:10.1016/j.jmmm.2025.172894

Hsiao-Wen Yu, Fung Jung Liu, YuShan Huang

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Abstract

The phase transition temperature and permeability spectra under magnetic fields for polycrystalline La_0.7Sr_0.3-_xK_xMnO₃ (0 ≤ x ≤ 0.15) were measured. All samples exhibited ferromagnetic–paramagnetic and corresponding metallic-insulating phase transitions. As the concentration of K⁺ ion increased, the phase transition temperature decreased. The relative complex permeability μ_r = μ_r′ − jμ_r′′ in the range of 10 kHz-13 MHz was investigated under an applied DC magnetic field B_dc. All measured magnetic spectra showed relaxation behavior due to domain wall displacement. As the doping concentration x increased, the permeability decreased, and the relaxation frequency f_r increased. Under B_dc, the amount of f_r increased rapidly. The slope of the f_r v.s. B_dc curve, defined as the magnetic field-to-frequency transfer ratio Δf_r/ΔB_dc, was enhanced by potassium doping. The highest Δf_r/ΔB_dc value (=1.89 kHz/Oe) was observed for the x = 0.15 sample. The significant change in f_r under B_dc shows promise for magnetic sensor applications.

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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.