Abstract
Using spin-polarized low-energy electron microscopy to study magnetization in epitaxial layered systems, we found that the area vs perimeter relationship of magnetic domains in the top Fe layers of $\mathrm{Fe}∕\mathrm{Ni}\mathrm{O}∕\mathrm{Fe}(100)$ structures follows a power-law distribution, with very small magnetic domain cutoff radius (about $40\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$) and domain wall thickness. This unusual magnetic microstructure can be understood as resulting from the competition between antiferromagnetic and ferromagnetic exchange interactions at the $\mathrm{Fe}∕\mathrm{Ni}\mathrm{O}$ interfaces, rather than from mechanisms involving the anisotropy and dipolar forces that govern length scales in conventional magnetic domain structures. Statistical analysis of our measurements validates a micromagnetic model that accounts for this interfacial exchange coupling.
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