Bulk SmCo5/alpha-Fe nanocomposite permanent magnets fabricated by mould-free Joule-heating compaction

TitleBulk SmCo5/alpha-Fe nanocomposite permanent magnets fabricated by mould-free Joule-heating compaction
Publication TypeJournal Article
Year of Publication2011
AuthorsRong CB, Zhang Y, Poudyal N, Wang DP, Kramer MJ, Liu JP
Journal TitleJournal of Applied Physics
Volume109
Pages07a735
Date Published04/01
Type of ArticleProceedings Paper
ISBN Number0021-8979
Accession NumberISI:000289949000253
Abstract

Bulk SmCo5/alpha-Fe nanocomposite magnets have been prepared using a Joule-heating compaction technique. Nearly fully dense bulk magnets are obtained by compacting the milled powders under a pressure of 2 GPa at temperatures above 400 degrees C. Structural analysis shows that the grain size of both the SmCo5 and the alpha-Fe phases is in the range of 10 to 15 nm when the compaction temperature is lower than 500 degrees C, which ensures effective interphase exchange coupling. A further increase in compaction temperature leads to significant grain growth and deterioration of magnetic properties. A maximum energy product of about 18.5 MGOe was obtained in the bulk SmCo5/alpha-Fe nanocomposite magnets, which is 90% higher than that of the single-phase counterpart prepared under the same conditions. (c) 2011 American Institute of Physics. [doi:10.1063/1.3563098]

URL<Go to ISI>://000289949000253
DOI10.1063/1.3563098
Alternate JournalJ. Appl. Phys.