• Title/Summary/Keyword: 자성구조

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PECS Process for Fabrication of Nanostructured Fe-Co Softmagnetic Alloy (나노구조 Fe-Co 연자성 합금의 제조를 위한 PECS 공정 연구)

  • Hong, Sung-Soo;Kim, Dae-Gun;Kim, Young-Do
    • Korean Journal of Materials Research
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    • v.11 no.5
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    • pp.378-384
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    • 2001
  • In this study, nanostructured Fe-Ce powder with grain size of 10nm was produced by MA (mechanical alloying) process and was consolidated by PECS (pulse electric current sintering) process for the fabrication of bulk nanostructured Fe-Co softmagnetic alloy. PECS process was performed at 700, 800, 900 and $^1000{\circ}C$ with holding time ranging from 0 to 15min. The effectiveness of PECS Process to Produce nanostructured bulk specimens was estimated. The optimal PECS process condition for nanostructured Fe-Co powders was found through observing the change of relative density and microstructure with sintering temperature and holding time. The magnetic properties of the sintered specimens were evaluated through the measurement of coercivity and saturation magnetization.

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First-principles Study on the Magnetism and Electronic Structure of (CrAs)3(MnAs)3(110) Superlattice ((CrAs)3(MnAs)3(110) 초격자의 전자구조와 자성에 대한 제일원리 연구)

  • Lee, J.I.;Hong, S.C.
    • Journal of the Korean Magnetics Society
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    • v.16 no.2
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    • pp.111-114
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    • 2006
  • We investigated the magnetism and electronic structures for the layered structures consisting of (110) layers of zinc-blende CrAs and MnAs. We calculated the electronic structures for $(CrAs)_3(MnAs)_3(110)$ superlattice consisted of alternating three layers of CrAs(110) and MnAs(110) by the full-potential linearized augmented plane wave (FLAPW) method. The calculated magnetic moment of Cr in interface layer ($3.07\;\mu_B$) was slightly larger than that of Cr atom in center layer ($3.06\;\mu_B$), while that of interface Mn atom ($3.74\;\mu_B$) was slightly smaller than the value of Mn atom in center layer ($3.76\;\mu_B$). The electronic structure and half-metallicity in this superlattice were discussed using the calculated density of states.