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    We have performed x-ray magnetic circular dichroism (XMCD) study on a series of Fe₁₋ₓMgₓO₄ (0<x<1.5) films on MgO (001). The XMCD measurements were based on Fe L₂,₃-edge x-ray absorption spectra, which is sensitive to both electronic state and local symmetry of the absorbing atom. A systematic decrease of local magnetic moments with increasing Mg concentration (x) was observed, which is in agreement with the results obtained by magnetometer measurement [1]. Our results further indicate that, in the region of 0.3<x<1.2, the decrease of magnetic moment occurs preferentially at the d⁶O₆ site. The decrease of magnetic moment becomes almost even in three Fe sites at higher Mg concentrations. The correlation between the cation distribution, the structural evolution and the magnetic behavior will be discussed. Two single-crystalline NaₓCoO₂ t ... 전체 초록 보기

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      UCI(KEPA) : I410-ECN-0101-2009-428-016709861