MAGNETIC-PROPERTIES AND STRUCTURE OF ND-(FE,B) NANOCOMPOSITE ALLOYS WITH FIXED FE B RATIOS AT 4-14/

Citation
Js. Fang et al., MAGNETIC-PROPERTIES AND STRUCTURE OF ND-(FE,B) NANOCOMPOSITE ALLOYS WITH FIXED FE B RATIOS AT 4-14/, JPN J A P 1, 36(10), 1997, pp. 6316-6324
Citations number
19
Volume
36
Issue
10
Year of publication
1997
Pages
6316 - 6324
Database
ISI
SICI code
Abstract
Magnetic properties and nanostructure of pseudobinary Nd-(Fe,B) alloys with lived Fe/B ratios of 4, 6, 8, 10, l4, respectively and Nd=3 to I I at %, prepared by melt-spinning and rapid thermal annealing (RTA), w ere investigated. Magnetic properties were found to depend on nanostru cture, particularly the size and size distribution of hard and soft ph ases, which were in turn determined by Nd contents and Fe/B ratios tog ether with RTA processing. The maximum energy products, (BH)(max), of the optimally RTA treated 11 at.%Nd flakes with Fe/B=IO and I4 are 19 MGOe and l8.8MGOe, respectively. However, the remanence decreases with increasing Nd contents due to the decreasing amount of Fe nanocrystal . The Fe/B=6 alloys with Nd < 6 at.% showed very low intrinsic coerciv ity (iHc) and (BH)(max), which were attributed mainly to impurity phas es, typically Nd2Fe23B3 and Nd1.1Fe4B4. The reversible and irreversibl e magnetization behaviors were also studied in order to qualify the ex change coupling interaction between hard and soft phases of alloys, Th e variation in nucleation field at the same Fe/B ratio of 14 was found to depend on volume fraction of hard phase formation as well as the s ize distribution of the two phases.