Correlation between microstructure and first-order magnetization reversal in the SmCo5/alpha-Fe nanocomposite magnets

TitleCorrelation between microstructure and first-order magnetization reversal in the SmCo5/alpha-Fe nanocomposite magnets
Publication TypeJournal Article
Year of Publication2011
AuthorsRong CB, Zhang Y, Kramer MJ, Liu JP
Journal TitlePhysics Letters A
Volume375
Pages1329-1332
Date Published03
Type of ArticleArticle
ISBN Number0375-9601
Accession NumberISI:000288145100010
Keywordscomposite permanent-magnets, First-order reversal curve, intergranular exchange interactions, Magnetostatic and, Nanocomposite magnets
Abstract

SmCo5/alpha-Fe nanocomposite magnets with different morphology have been fabricated by ball milling of the micrometer sized SmCo5 and alpha-Fe powders. The alpha-Fe grains vary from elongated nano-strips to spherical nanoparticles with increasing milling time. The inter-phase exchange coupling is enhanced with increasing milling time due to reduced grain size. The first-order reversal curves (FORCs) are taken to identify optimal conditions for exchange coupling. It has been found that the stripped morphology results in weak inter-phase exchange coupling, while enhanced exchange coupling is observed with further reduction of the soft-phase grain size. Compared with the measurement of demagnetization curves, FORC analysis provides more information on the magnetostatic as well as the exchange interactions. (C) 2011 Elsevier B.V. All rights reserved.

URL<Go to ISI>://000288145100010
DOI10.1016/j.physleta.2011.02.006
Alternate JournalPhys. Lett. A