Publication: Tailoring magnetic properties of Fe_(0.65)Co_(0.35) nanoparticles by compositing with RE_(2)O_(3) (RE = La, Nd, and Sm)
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2022-10-18
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Abstract
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 (Fe_(0.65)Co_(0.35))_(0.95)((RE_(2)O_(3))_(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 scannin)g calorimetry) have revealed different properties, depending on the dopant type. The RE_(2)O_(3) 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 RE_(2)O_(3), the cold welding between Fe-Co ductile particles was minimized, indicating a significant decrease in the average particle size. The parent Fe_(0.65)Co_(0.35) 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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© 2022 by the authors. Licensee MDPI
This work was partly supported by the subsidies budget of the Faculty of Mathematics and Natural Sciences of Cardinal StefanWyszy´ nski University (Warsaw, Poland), the Institute of Physics of the Polish Academy of Sciences (Warsaw, Poland), and the Faculty of Physics and Applied Computer Science of AGH University Science and Technology (Kraków, Poland) via international cooperation.