Journal
APPLIED SURFACE SCIENCE
Volume 471, Issue -, Pages 273-276Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2018.11.217
Keywords
Permanent magnets; Electrospinning; Samarium-cobalt-iron; Reduction-diffusion process; Magnetic properties
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Funding
- Future Materials Discovery Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [NRF-2016M3D1A1027836]
- Ministry of Trade, Industry Energy (MOTIE)
- Korea Institute for Advancement of Technology (KIAT) through the Encouragement Program for Regional Industry Nurturing Program [R0004915]
- Korea Evaluation Institute of Industrial Technology (KEIT) [R0004915] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We propose the substitution of some Co atoms in SmCo nanofibers with earth-abundant Fe as a means to prepare low-cost magnets with enhanced intrinsic magnetic properties compared to those of pure SmCo. To investigate the effect of Fe substitution upon microstructural and magnetic properties, we synthesized SmCoFe nanofibers (150-200 nm diameter) having various degrees of Fe substitution (0, 5, 10, 20, and 40 at%) via electrospinning and subsequent reduction using CaH2. All Fe-substituted samples showed an enhancement in (BH)(max) as compared to their non-substituted counterpart. Interestingly, substituting appropriate amount of Fe for Co enabled simultaneous increase of M-s, H-ci and thus (BH)(max) of the SmCo nanofibers, resulting from an effective exchange-coupling effect: Superior H-ci (about 7375 Oe) and a (BH)(max) (about 13.17 MG center dot Oe) over 153% that of non-substituted SmCo nanofibers were obtained in the 10 at% Fe-substituted sample. This work describes the synthesis of SmCoFe ternary magnetic nanofibers and elucidates the phase formation mechanism and the effect of Fe substitution in optimizing magnetic performance. This understanding can be extended to the synthesis of other SmCo phases having different chemical compositions and may enable access to a path far beyond the limitations of traditional magnetic materials.
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