The Magnetization Reversal Processes Of Bulk (Nd, Y)-(Fe, Co)-B Alloy In The As-Quenched State

• Published in: Archives of metallurgy and materials 2015-09, Vol.60 (3), p.1587-1590
• Main Authors: Dośpiał, M., Nabiałek, M., Szota, M., Gondro, J.
• Format: Article
• Language: English
• Subjects: Cobalt; Domain walls; Grains; hard magnetic materials; Iron; Magnetic domains; Magnetic fields; Magnetic moments; Magnetization curves; Magnetization reversal; Maxima; nano-materials; Neodymium; Pinning; Quenching
• ISSN: 2300-1909; 1733-3490; 2300-1909
• DOI: 10.1515/amm-2015-0277

The magnetization reversal processes of bulk Fe Co Nd alloy in the as-quenched state have been investigated. From the analysis of the initial magnetization curve and differential susceptibility versus an internal magnetic field it was deduced, that the main mechanism of magnetization reversal process is the pinning of domain walls at the grain’s boundaries of the Nd Fe B phase. Basing on the dependence of the reversible magnetization component as a function of magnetic field it was found that reversible rotation of a magnetic moment vector and motion of domain walls in multi-domain grains result in high initial values of the reversible component. The presence of at least two maxima on differential susceptibility of irreversible magnetization component in function of magnetic field imply existence of few pinning sites of domain walls in Fe Co Nd alloy. The dominant interactions between particles have been determined on the basis of the Wohlfarth dependence. Such a behavior of Wohlfarth’s plot implies that the dominant interaction between grains becomes short range exchange interactions.