In this study, ultra-fine soft-magnetic micro-powders are prepared by high-pressure gas atomization of an Fe-based alloy, Fe-Hf-B-Nb-P-C. Spherical powders are successfully obtained by disintegration of the alloy melts under high-pressure He or N2 gas. The mean particle diameter of the obtained powders is 25.7 μm and 42.1 μm for He and N2 gas, respectively. Their crystallographic structure is confirmed to be amorphous throughout the interior when the particle diameter is less than 45 μm. The prepared powders show excellent soft magnetic properties with a saturation magnetization of 164.5 emu/g and a coercivity of 9.0 Oe. Finally, a toroidal core is fabricated for measuring the magnetic permeability, and a μr of up to 78.5 is obtained. It is strongly believed that soft magnetic powders prepared by gas atomization will be beneficial in the fabrication of high-performance devices, including inductors and motors.

Abstract
 1. 서 론
 2. 실험방법
 3. 실험결과 및 고찰
 4. 결 론
 References

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• 양동열(한국기계연구원 부설 재료연구소, 분말/세라믹 연구본부) | Dong-Yeol Yang (Korea Institute of Materials Science)
• 김기봉(한국기계연구원 부설 재료연구소, 분말/세라믹 연구본부) | Ki Bong Kim (Korea Institute of Materials Science)
• 이준홍(한국기계연구원 부설 재료연구소, 분말/세라믹 연구본부) | Junhong Lee (Korea Institute of Materials Science)
• 김영자(한국기계연구원 부설 재료연구소, 분말/세라믹 연구본부) | Young Ja Kim (Korea Institute of Materials Science)
• 임태수(한국기계연구원 부설 재료연구소, 분말/세라믹 연구본부) | Tae-Soo Lim (Korea Institute of Materials Science)
• 양상선(한국기계연구원 부설 재료연구소, 분말/세라믹 연구본부) | Sangsun Yang (Korea Institute of Materials Science)
• 이민하(한국생산기술연구원, 뿌리산업연구부문) | Min Ha Lee (Korea Institute of Industrial Technology)
• 김휘준(한국생산기술연구원, 뿌리산업연구부문) | Hwi Jun Kim (Korea Institute of Industrial Technology)
• 김용진(한국기계연구원 부설 재료연구소, 분말/세라믹 연구본부) | Yong-Jin Kim (Korea Institute of Industrial Technology) Corresponding Author