Abstract
A new series of metal-substituted ϵ-iron oxides, ϵ-RuxFe2−xO3, nanoparticles are synthesized by sintering iron oxide hydroxide with ruthenium hydroxide in a silica matrix. RuIII selectively substitutes into the regular octahedral C site among the four non-equivalent Fe sites (A, B, C, and D site). Even a small amount of Ru substitution (less than 1% of Fe) contributes to increase the Hc value (i.e., the Hc value at 300 K increases 15% at x = 0.014). The observed increase in Hc can be understood by the large single ion magnetic anisotropy due to strong spin–orbit interaction of RuIII. More information can be found in the Communication by A. Namai and S. Ohkoshi on page 11880 ff.
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