In Situ Composites of ${\alpha } $ -Co sub(x)Fe sub(2-x)O sub(3) With ${\varepsilon } $ -Co sub(x)Fe sub(2-x)O sub(3) or With Co-Fe Alloys Having Different Morphology and Better Magnetic Behavior

• Published in: IEEE transactions on magnetics 2016-09, Vol.52 (9), p.1-6
• Main Authors: Goyal, Pankaj, Prasad, Nand Kishore
• Format: Article
• Language: English
• Subjects: Alloys; Atmospheres; Cobalt base alloys; Coercive force; Molecular composites; Nanostructure; Oxides; Sintering
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2016.2561899

One-dimensional magnetic materials find several applications in modern technology. Co-Fe alloys and their oxides Co sub(x)Fe sub(2-x)O sub(3) ( $0 \leq \times \leq 0.7$ ) were prepared using a very simple and novel technique. The X-ray diffraction patterns confirm the coexistence $\alpha $ -Fe sub(2)O sub(3) and $\varepsilon $ -Fe sub(2)O sub(3) phases in the as-prepared as well as the sample sintered in N sub(2) atmosphere. In contrast, samples sintered in H sub(2) atmosphere could provide Co-Fe alloys and $\alpha $ -Fe sub(2)O sub(3) composites. Nanorod shapes for oxide samples were corroborated by scanning and transmission electron microscopy. A reasonably high coercivity value ( $\sim 118$ mT) was observed for such rods, whereas a sufficiently high saturation magnetization value near 162 Am super(2)/kg was obtained for other types of composites.