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RISS 인기검색어
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- 저자 : 최승리(Seung-Li Choi) (검색결과 2 건)
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이희정(Hee Jung Lee),최승리(Seung-Li Choi),이중한(Jung Han Lee),김광주(Kwang Joo Kim),최동혁(Dong Hyeok Choi),김철성(Chul Sung Kim) 한국자기학회 2007 韓國磁氣學會誌 Vol.17 No.2
By substituting Cr in inverse-spinel Fe₃O₄, Cr<SUB>x</SUB>Fe<SUB>3-x</SUB>O₄ thin film samples were prepared by sol-gel spin-coating method and their structural, electronic, and magnetic properties were analyzed. X-ray diffraction indicates that the lattice constant decrease with increasing Cr composition (x). This result can be explained in terms of occupation of octahedral sites by Cr<SUP>3+</SUP> ions with smaller ionic radius than that of Fe<SUP>3+</SUP>. Vibrating sample magnetometry measurements on the samples at room temperature revealed that saturation magnetization (M<SUB>s</SUB>) decrease by Cr substitution, explainable by comparing spin magnetic moment among the related transition-metal ions. A decrease of magnetoresistence effect with x was observed, similar to that of M<SUB>s</SUB>. The coercivity of the Cr<SUB>x</SUB>Fe<SUB>3-x</SUB>O₄ films was found to increase with x, attributed to the increase of magnetic anisotropy by the existence of octahedral Cr<SUP>3+</SUP>(d<SUP>3</SUP>).
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역스피넬 Fe₃O₄ 박막의 바나듐 도핑에 따르는 자기적 성질 변화
김광주(Kwang Joo Kim),최승리(Seung-Li Choi),박영란(Young Ran Park),박재윤(Jae Yun Park) 한국자기학회 2006 韓國磁氣學會誌 Vol.16 No.1
Effects of V substitution of Fe on the magnetic properties of Fe₃O₄ have been investigated by x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), conversion electron Mossbauer spectroscopy (CEMS), and vibrating sample magnetometry (VSM) measurements on sol-gel-grown films. XRD data indicates that the VxFe₃-xO₄ films maintain cubic structure up to x=1.0 with little change of the lattice constant. Analyses on V 2p and Fe 2p levels of the XPS data indicate that V exist as V³+ mostly in the VxFe₃-xO₄ films with the density of V²+ ions increasing with increasing V content. Analyses on the CEMS data indicate that V³+ ions substitute tetrahedral Fe³+ sites mostly, while V²+ ions octahedral Fe²+ sites. Results of room-temperature VSM measurements on the films reveal that the saturation magnetization for the x=0.14 sample is larger than that of Fe₃O₄, while it becomes smaller than that of Fe₃O₄ for x≥0.5. The coercivity of the VxFe₃-xO₄ films is found to increase with x, attributed to the increase of anisotropy by the substitution of V²+(d³) ions into the octahedral sites.
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