AUTHOR=Lee Jimin , Hwang Tae-Yeon , Kang Min Kyu , Cho Hong-Baek , Kim Jongryoul , Myung Nosang V. , Choa Yong-Ho 

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

JOURNAL=Frontiers in Chemistry

VOLUME=6

YEAR=2018

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2018.00018

DOI=10.3389/fchem.2018.00018

ISSN=2296-2646

ABSTRACT=<p>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 &lt; Sm &lt; 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<sub>2</sub>Co<sub>17</sub> fibers were synthesized when the metal precursor ratio (Sm<sup>3+</sup>/(Sm<sup>3+</sup>+Co<sup>2+</sup>)) was precisely controlled at 10.6%, whereas mixed phases (i.e., Co-Sm<sub>2</sub>Co<sub>17</sub> or Sm<sub>2</sub>Co<sub>17</sub>-Sm<sub>2</sub>Co<sub>7</sub>) were observed when the ratio is deviated from the stoichiometric. Magnetic saturation (<italic>M</italic><sub><italic>s</italic></sub>) of the synthesized fibers monotonically decreased with an increased in Sm content. In contrast, coercivity (<italic>H</italic><sub><italic>c</italic></sub><sub>i</sub>) monotonically increased with an increase in Sm content.</p>