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        Zn<SUB>1−x</SUB>Fe<SUB>x</SUB>O의 뫼스바우어 분광학적 연구

        김성진(S. J. Kim),이상률(S. R. Lee),박철수(C. S. Park),김응찬(E. C. Kim),조영걸(Y. G. Joh),김동호(D. H. Kim) 한국자기학회 2008 韓國磁氣學會誌 Vol.18 No.2

        Recently, the - semiconductor ZnO, normally n-type, doped with magnetic impurities was reported to be ferromagnetic above room temperature. Since ZnO is optically transparent, ferromagnetic Zno should a transparent magnet as well. The purpose of this study was to carry out Mossbauer, X-ray and magnetic-susceptibility measurements on ZnO<SUB>0.99</SUB>Fe<SUB>0.01</SUB>O to examine its magnetic properties and to separate the contributions of the ferromagnetic and the paramagnetic phases to the magnetization. The X-ray diffraction (XRD) data for Zn<SUB>0.99</SUB>Fe<SUB>0.01</SUB>O showed a typical hexagonal structure, with no indication of a secondary phase. The magnetic hysteresis (M-H) curve at room temperature showed an obvious ferromagnetic behaviour, and the magnetic moment per Fe atom under an applied field of 0.8 T was estimated to be about 2 μB, suggesting a low spin configuration of Fe ions. Mossbauer spectra of Zno<SUB>0.99</SUB>Fe<SUB>0.01</SUB>O have been taken at various temperatures ranging from 100 to 300 K. The Mossbauer spectrum of Zn<SUB>0.99</SUB>Fe<SUB>0.01</SUB>O consists of a ferromagnetic (six-Lorentzian) and a paramagnetic phase (doublet).

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