Magnetism and Magnetic Field Effects for Functional Control of BaTiO3 and Co3O4

作者：Tianqi Huang · 发表于：UNSWorks (University of New South Wales, Sydney, Australia) · 年份：2026 · DOI：10.26190/unsworks/32622 · 研究领域：Chemical and Physical Properties of Materials、Multiferroics and related materials、Electronic and Structural Properties of Oxides

Magnetism can be considered not only an inherent property of materials but also an external "knob" to regulate structure-property relationships and dynamic interfacial processes. This dissertation explores magnetic materials from three complementary yet independent perspectives, with the core theme being the functional modulation of solid-state and electrochemical systems through magnetic response and magnetic fields. Firstly, this thesis provides a focused review of magneto-optical Kerr effect (MOKE) microscopy and related magnetic characterization techniques, outlining their physical principles, typical experimental configurations, and practical strengths for probing magnetic states with high sensitivity and spatiotemporal resolution, while summarizing common pitfalls and recommended practices for quantitative analysis. Then, the next part demonstrates a solid-state route to introduce magnetic response into an intrinsically nonmagnetic functional oxide through doping and defect engineering. Using barium titanate (BaTiO3, BTO) as a model ferroelectric perovskite, a series of BaTi0.9M0.1O3 ceramics (M = Fe, Mn, Co, Cr) were synthesized and systematically characterized using X-ray diffraction (XRD), scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS), Raman spectroscopy, inductively coupled plasma mass spectrometry (ICP-MS), X-ray photoelectron spectroscopy (XPS), and vibrating sample magnetometer (VSM). The results showed that the perovskite structure was pr...