Abstract
We report magnetic and superlattice imaging of ferrimagnetic bilayered ${\text{LuFe}}_{2}{\text{O}}_{4}$ with strong uniaxial magnetic anisotropy. Magnetization reversal is imaged in magnetic fields up to 8 T at several temperatures below ${T}_{N}$ $(\ensuremath{\sim}230\text{ }\text{K})$ and charge-ordered superlattice domains are imaged at 92 K. We observed random packing of irregular pancakelike magnetic domains $(\ensuremath{\sim}100\text{ }\text{nm}\ifmmode\times\else\texttimes\fi{}30\text{ }\text{nm})$ and charge-ordered superlattice domains with similar shape $(\ensuremath{\sim}30\text{ }\text{nm}\ifmmode\times\else\texttimes\fi{}6\text{ }\text{nm})$. The magnetic domain structure shows a strong memory effect in magnetization reversal. Our results are consistent with a spin-charge cross-coupling mechanism in ${\text{LuFe}}_{2}{\text{O}}_{4}$.
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