Abstract
Self-assembled Sm–Co nanoparticles in the form of spherical aggregates (referred as nanospheres) with diameter ranging from 50 to 180 nm were achieved by means of polyol technique. The size distribution of the Sm–Co nanospheres can be regulated close to ∼100 nm by controlling the molar ratio of Sm:Co precursor. The spherical aggregates exhibited Sm 2Co 7 phase as a major constituent; while the aggregates obtained at higher Co concentration showed co-existence of Co-phase with Sm 2Co 7 phase. Upon annealing, the biphasic nature of nanospheres (Sm 2Co 7/Co) transformed into Sm 2Co 17 structure. By varying the Sm:Co precursor ratio from 1:5 to 1:9, the coercivity ( H c ) and magnetization ( M s ) values of the as-synthesized nanospheres can be tuned from 336 to 140 Oe and from 63.7 to 108 emu/g, respectively, and these values significantly improved after annealing. Maximum values of H c (1050 Oe) at the Sm:Co molar ratio of 1:5 and M s of 184.6 emu/g at the Sm:Co molar ratio of 1:9 were achieved in the annealed samples.
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