Abstract
We report ac susceptibility data on ${\mathrm{RuSr}}_{2}(\mathrm{E}\mathrm{u},\mathrm{C}\mathrm{e}{)}_{2}{\mathrm{Cu}}_{2}{\mathrm{O}}_{10\ensuremath{-}y}$ (Ru-1222, Ce content $x=0.5$ and 1.0), ${\mathrm{RuSr}}_{2}{\mathrm{GdCu}}_{2}{\mathrm{O}}_{8}$ (Ru-1212), and ${\mathrm{SrRuO}}_{3}.$ Both Ru-1222 $(x=0.5,$ 1.0) sample types exhibit unexpected magnetic dynamics in low magnetic fields: logarithmic time relaxation, switching behavior, and ``inverted'' hysteresis loops. Neither Ru-1212 nor ${\mathrm{SrRuO}}_{3}$ exhibit such magnetic dynamics. The results are interpreted as evidence of the complex magnetic order in Ru-1222. We propose a specific multilayer model to explain the data, and note that superconductivity in the ruthenocuprate is compatible with both the presence and absence of the magnetic dynamics.
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