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High-throughput synthesis of Samarium-Cobalt sub-micron fibers with controlled composition and dimension was demonstrated by combining electrospinning and reduction-diffusion processes. The composition of fibers was readily varied (8 < Sm < 20 at.%) by adjusting precursor composition whereas the diameter of fibers was precisely controlled by varying electrospinning parameters (e.g., applied voltage, solution feed rate, temperature, and humidity) to reach single-domain size. X-ray diffraction patterns confirmed that single phase Sm 2 Co 17  fibers were synthesized when the metal precursor ratio (Sm 3+ /(Sm 3+ +Co 2+ )) was precisely controlled at 10.6%, whereas mixed phases (i.e., Co-Sm 2 Co 17  or Sm 2 Co 17 -Sm 2 Co 7 ) were observed when the ratio is deviated from the stoichiometric. Magnetic saturation ( M   s  ) of the synthesized fibers monotonically decreased with an increased in Sm content. In contrast, coercivity ( H   c   i ) monotonically increased with an increase in Sm content.

Synthesis of Samarium-Cobalt Sub-micron Fibers and Their Excellent Hard Magnetic Properties