Magnetic properties of gadolinium and/or dysprosium substituted Sm–Co nanocomposite ribbons

• Published in: Journal of rare earths 2024-06, Vol.42 (6), p.1093-1100
• Main Authors: Raja, Akila, Aich, Shampa
• Format: Article
• Language: English
• Subjects: Curie temperature; Heavy rare-earth; Melt-spinning; Permanent magnets; Rare earths
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/j.jre.2023.08.003

The present study reported the influence of heavy rare-earth elements (Gd and/or Dy) on Sm-Co-based melt-spun ribbons. Microstructure and magnetic properties of Sm-Co-based (Sm1–xRExCo5) ternary and quaternary systems were investigated. The X-ray diffraction, Auger spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses reveal the presence of the 1:5H and 2:17R phases in the as-spun ribbons. A high-temperature magnetic measurement reports a Curie temperature (TC) at ∼825 and ∼869 K in Sm0.6Gd0.4Co5 (ribbon A) and Sm0.6Gd0.3Dy0.1Co5 (ribbon B), respectively. A low-temperature magnetic measurement on Sm0.6Gd0.3Dy0.1Co5 ribbons exhibits a type-2 SR (spin reorientation) behaviour at ∼72 K, which arises due to the presence of the DyCo5 phase. Room temperature magnetic measurements reveal that overall magnetic measurement (OMP) is about 24 and 29.9 for ribbons A and B, respectively. Consequently, the comparative investigations profess that ribbon B shows better magnetic performance due to Dy addition with reduced grain size. This observation indicates that the Gd and Dy substituted Sm–Co magnet can be a potential magnet for high-temperature applications. Synthesisation and optimisation of Sm-HRE-Co-based rapidly solidified magnets. [Display omitted]