Basic Composition and Structural Characteristics
Core Composition: Primarily composed of iron oxide (Fe₂O₃) combined with various metal oxides such as zinc, manganese, nickel, and barium; they resemble ceramics in appearance and are often referred to as "magnetic ceramics."
Crystal Structure: Primarily categorized into three types-spinel, magnetoplumbite, and garnet-with each structure corresponding to specific properties and application scenarios.
Magnetic Nature: Classified as ferrimagnetic materials; they exhibit macroscopic magnetism through oxygen-ion-mediated superexchange interactions, distinguishing them from the direct electron spin exchange mechanisms found in metallic magnetic materials.
Key Physical Property Characteristics
High Resistivity: Resistivity can exceed 10⁸ Ω·cm-far higher than that of metallic magnetic materials-resulting in extremely low eddy current losses, making them particularly suitable for high-frequency applications.
Versatile Magnetic Properties:Different grades can achieve distinct characteristics such as high permeability, high coercivity, or rectangular hysteresis loops, meeting diverse needs ranging from soft magnetic and permanent magnetic to gyromagnetic applications.
Good Temperature Stability:Permeability shows minimal variation with temperature; performance fluctuations remain under 5% within the -40°C to 250°C range, allowing for stable magnetic performance even at high temperatures.
Mechanical and Chemical Properties:They possess high mechanical strength and hardness, are naturally resistant to moisture and corrosion, and do not easily rust during long-term outdoor use.
