Permanent magnet with improved coercive force
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- AARHUS UNIV
- Filing Date
- 2023-06-09
- Publication Date
- 2026-05-22
AI Technical Summary
There is a need for an efficient method to produce rare-earth-free permanent magnets, such as hexaferrites, with enhanced magnetic properties using industrially feasible methods and resources, as rare-earth magnets like NdFeB are costly and environmentally impactful.
A manufacturing method involving the controlled misalignment of magnetic moments in bulk magnetic materials by combining anisotropic and non-anisotropic crystallites of iron-based oxides, specifically M-type strontium hexaferrite (SrFe12O19), through uniaxial pressure and controlled heating, without the need for external magnetic fields or spark plasma sintering.
This method results in bulk magnetic materials with improved coercivity and scalability, offering a cost-effective and environmentally friendly alternative to rare-earth magnets.
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