Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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The Effect of Additional Elements on the Tailored Magnetic Properties of Electrochemically Prepared CoPtP-X Alloys

전기화학적으로 제조한 CoPtP-X합금의 첨가제 효과에 따른 맞춤형 자기적 성질

  • Park, H.D. (Materials Science & Technology Division, KIST) ;
  • Lee, K.H. (Materials Science & Technology Division, KIST) ;
  • Kim, G.H. (Materials Science & Technology Division, KIST) ;
  • Jeung, W.Y. (Materials Science & Technology Division, KIST) ;
  • Choi, D.H. (Memory manufacturing division, Hynix) ;
  • Lee, W.Y. (Department of Metallurgical Engineering, Yonsei University)
  • 박호동 (한국과학기술연구원 재료연구부) ;
  • 이관희 (한국과학기술연구원 재료연구부) ;
  • 김긍호 (한국과학기술연구원 재료연구부) ;
  • 정원용 (한국과학기술연구원 재료연구부) ;
  • 최동훈 (하이닉스반도체 메모리제조본부) ;
  • 이우영 (연세대학교 금속시스템공학과)
  • Published : 2005.05.01
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Abstract

Coptp films with the additive elements (X=Fe, Mn) of varying concentrations were prepared by in-situ electrodeposition, to tailor their magnetic properties. Alloys of CoPtP-X (X=Fe, Mn) were synthesized by changing the solution concentrations of Fe and Mn for electrodeposition. In the electrodeposited CoFePtP alloys, preferred orientation of the electrodeposited films changed from hexagonal (001) to (100) direction with increasing iron contents as revealed by X-ray diffraction, and these films exhibited various magnetic properties ranging from a typical hard magnetic to a soft magnetic property in accordance with microstructural variations. In the case of Mn addition, excellent hard magnetic property was observed at a specific Mn concentration of 0.0126 M in the electrolyte, with the coercivity of 4630 Oe and squareness of 0.856 and this was attributed to the fact that magnetization easy-axis (hexagonal c-axis) coincides with the preferred growth orientation of the film confirmed by transmission electron microscopy.

본 연구에서는 CoPtP합금에 첨가원소로 Fe, Mn을 첨가하여 그에 따른 자기적 성질을 제어하고자 하였다. 우선 합금을 합성하기 위해서 용액 중 Fe, Mn의 농도를 변화시키면서 전기도금 방식을 이용하여 CoPtP-X (X=Fe, Mn) 합금을 제조하였다 Fe를 첨가한 합금박막에서는 X선 회절분석 견과 Fe함량이 증가함에 따라 CoPtP합금의 수직방향으로의 우선결정방향이 조밀육방정 [001]방향에서 [100] 방향으로 변화함을 관찰하였고, 이에 따라 결정 자기이방성이 변화하여 전형적인 경자성 특성에서 연자성 특성까지 자기적 특성을 제어할 수 있었다. 용액 중 첨가된 망간의 농도를 변화시켜 제조된 CopPtP-Mn 합금박막에서는 Mn의 농도가 0.0126M일 때 보자력(coercivity)과 각형비(squareness, Mr/Ms)가 각각 4630 Oe, 0.856의 매우 우수한 자기적 성질을 나타내었으며, 이는 Mn의 특정농도에서 CoPtP 합금박막의 우선결정 성장방향인 조밀육방정 c축이 박막면에 대하여 수직하게 놓이는 현상에서 기인된다는 것을 투과전자현미경 분석을 통해 확인하였다.

Keywords

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