Journal
MATERIALS
Volume 15, Issue 20, Pages -Publisher
MDPI
DOI: 10.3390/ma15207290
Keywords
Fe-Co; Fe; Co-0 65; (0 35); nanoparticles; rare-earth elements; soft magnetic materials
Categories
Funding
- Faculty of Mathematics and Natural Sciences of Cardinal StefanWyszynski University (Warsaw, Poland)
- Institute of Physics of the Polish Academy of Sciences (Warsaw, Poland)
- Faculty of Physics and Applied Computer Science of AGH University Science and Technology (Krakow, Poland)
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This study reports the magnetic properties of lanthanide-substituted Fe-Co alloy nanoparticles prepared by mechanical alloying. The results show that the dopant type has a significant impact on the magnetic properties, and the processing route presented here is cost-effective for large-scale production of soft magnetic materials.
Fe-Co alloys are the most important soft magnetic materials, which are successfully used for a wide range of applications. In this work, the magnetic properties of lanthanide-substituted (Fe0.65Co0.35)(0.95)(RE2O3)(0.05) (RE = La, Nd, and Sm) nanoparticles, prepared by mechanical alloying, are reported. Our comprehensive studies (X-ray diffraction, Mossbauer spectroscopy, scanning electron microscopy with X-ray energy dispersive spectrometry, SQUID magnetometry and differential scanning calorimetry) have revealed different properties, depending on the dopant type. The RE2O3 addition led to a decrease in the crystallite size and to an increase in the internal microstrain. Moreover, because of the high grain fragmentation tendency of RE2O3, the cold welding between Fe-Co ductile particles was minimized, indicating a significant decrease in the average particle size. The parent Fe0.65Co0.35 alloy is known for its soft ferromagnetism. For the La-substituted sample, the magnetic energy product was significantly lower (0.450 MG center dot Oe) than for the parent alloy (0.608 MG center dot Oe), and much higher for the Sm-substituted compound (0.710 MG center dot Oe). The processing route presented here, seems to be cost-effective for the large-scale production of soft magnetic materials.
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