Abstract
We report the near-edge x-ray absorption spectroscopy (NEXAFS) at the Co/MnL3,2 edge and oxygen K edge of the well-characterized Bi-substitutedCo2MnO4 multiferroic samples. The evolution of peak features in NEXAFS spectra of the Co/MnL3,2 edge and O K edge show the Bi-induced redistribution of magnetic cations (Co/Mn). Thevariation in valence states of Co and Mn in all the substituted compositions is consistentwith the observed ferrimagnetic behaviour of the samples. Magnetization data show thedecrease in molecular field complementing the ferrimagnetism. The role of Bi in theenhancement of magnetic interactions as well as the appearance of ferroelectricity inBixCo2−xMnO4 (0≤x≤0.3) is discussed.
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