Oxygen vacancy-engineered interface reactions through controlled roasting temperature for enhanced performance of FeSiCr-based soft magnetic composites
Soft magnetic composites, composed of magnetic metals and insulating mediums, are promising candidates for achieving high permeability and low coercivity, which are crucial for modern electronic devices operating at high frequencies and increased power densities. However, traditional organic insulat...
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| Príomhchruthaitheoirí: | , , , , , |
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| Formáid: | Alt |
| Teanga: | Béarla |
| Foilsithe / Cruthaithe: |
Elsevier
2025-09-01
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| Sraith: | Materials & Design |
| Ábhair: | |
| Rochtain ar líne: | http://www.sciencedirect.com/science/article/pii/S0264127525008640 |
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| Achoimre: | Soft magnetic composites, composed of magnetic metals and insulating mediums, are promising candidates for achieving high permeability and low coercivity, which are crucial for modern electronic devices operating at high frequencies and increased power densities. However, traditional organic insulation systems suffer from poor thermal stability, limiting their high-temperature applications. This study introduces an innovative oxygen vacancy-mediated interface reaction engineering strategy to enhance the properties of FeSiCr-based soft magnetic composites. By applying a manganese acetate precursor to form an oxygen vacancy-rich MnO (MnO-Vo) coating on FeSiCr soft magnetic powders, followed by controlled roasting (400–800 °C), the MnO-Vo structure facilitates the selective oxidation of silicon, resulting in a stable and uniform SiO2/MnO composite inorganic insulation layer. Microstructural characterization revealed that roasting temperature significantly affected the morphology, thickness, and uniformity of the SiO2/MnO composite insulation layer, with optimal results achieved at 600 °C. The resulting FeSiCr@SiO2/MnO composites exhibited a four-order increase in volume resistivity compared to pure FeSiCr, excellent magnetic stability with an effective permeability of 36.8, and a remarkably low core loss of 95.4 kW/m3 at 10 mT and 500 kHz. The oxygen vacancy-controlled interface reaction mechanism proposed in this study offers new perspectives for designing low-loss soft magnetic composites with enhanced electromagnetic properties. |
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| ISSN: | 0264-1275 |