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Microstructure and coupling mechanisms in MnBi-FeSiB nanocomposites obtained by spark plasma sintering
A Alexandru-Dinu1,2, C Locovei1,2, C Bartha1
1National Institute of Materials Physics, Street Atomistilor 405A, 077125, Magurele, Romania.
Scientific Reports
|July 23, 2024
Summary
Researchers developed novel rare-earth-free permanent magnets using hard low-temperature phase MnBi and soft FeSiB phases. Spark plasma sintering enabled tunable magnetic properties through controlled microstructure and exchange spring effects.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Development of rare-earth-free permanent magnets is crucial for sustainable technology.
- Hard-soft magnetic nanocomposites offer potential for enhanced magnetic properties.
Purpose of the Study:
- To fabricate and characterize hard-soft nanocomposites of LTP-MnBi and Fe70Si10B20.
- To investigate the influence of composition and processing on magnetic properties and microstructure.
- To explore the potential for rare-earth-free permanent magnet applications.
Main Methods:
- Spark plasma sintering of powder mixtures.
- X-ray diffraction, scanning and transmission electron microscopy.
- Magnetometry and 57Fe Mössbauer spectroscopy.
Main Results:
- Successfully fabricated Mn55Bi45 + x·(Fe70Si10B20) nanocomposites.
- Observed complex correlations between composition, processing, microstructure, and magnetic properties.
- Discovered tunable exchange spring effects sensitive to morpho-structural and compositional features.
Conclusions:
- Spark plasma sintering is a viable route for creating MnBi-based composites with tunable magnetic properties.
- These nanocomposites show high potential for rare-earth-free permanent magnet applications.
- Understanding microstructure-property relationships is key for optimizing magnetic performance.
