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The charge order in multiferroic LuFe204 has been investigated with resonant x-ray diffraction at the Fe Κ edge in the combined charge ordered and magnetic phase. The energy dependence of the charge order reflection (⅓⅓&frac72;) has been analyzed in detail to investigate the charge disproportionation between the iron sites as a function of temperature. It is found that the charge disproportionation is constant within 0.02e across the Néel temperature TN. The charge order reflection exhibits a decrease in intensity with increasing temperature which is attributed to an increase in the probability of electron hopping. We confirm the increase in polarization at TN is not of static origin but rather dynamic. Our observations are consistent with antiferromagnetically aligned magnetic moments inhibiting the double exchange mechanism and reducing the p robability of electrons hopping between Fe"*" and Fe3+ in the magnetic phase. [ABSTRACT FROM AUTHOR]

The article focuses on the challenge of using the interdependence of multiple properties in modern devices with one property being controlled by tweaking another, discussing another way that ferromagnetism can be induced in bismuth ferrite (BiFeO3), one of the most studied multiferroics. The means is through substrate-induced strain. Strain is cited to provide useful control of the orientation of magnetic moments in the multiferroics.