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We describe a strategy for using resonant soft x-ray scattering (RSXS) tostudy the electronic structure of transition metal oxide quantum wires. Usingelectron beam lithography and ion milling, we have produced periodic, patternedarrays of colossal magnetoresistance (CMR) phase La(1-x)Sr(x)MnO(3) consistingof ~ 5000 wires, each of which is 80 nm in width. The scattered intensityexhibits a series of peaks that can be interpreted as Bragg reflections fromthe periodic structure or, equivalently, diffraction orders from thegrating-like structure. RSXS measurements at the Mn L(2,3) edge, which has alarge magnetic cross section, show clear evidence for a magnetic superstructurewith a commensurate period of five wires, which we interpret as commensuratelymodulated antiferromagnetism. This superstructure, which is accompanied bynon-trivial reorganization of the magnetization within each wire, likelyresults from classical dipole interactions among the wires. We introduce asimple, exactly soluble, analytic model of the scattering that captures,semi-quantitatively, the primary features in the RSXS data; this model will actas a foundation for forthcoming, detailed studies of the magnetic structure inthese systems.

Resonant soft x-ray scattering from La(1-x)Sr(x)MnO(3) quantum wire arrays