Spin-Flop Coupling and Exchange Bias in Embedded Complex Oxide Micromagnets

The magnetic domains of embedded micromagnets with 2 mu m X 2 mu m dimensions defined in epitaxial La0.7Sr0.3MnO3 (LSMO) thin films and LaFeO3/LSMO bilayers were investigated using soft x-ray magnetic microscopy. Square micromagnets aligned with their edges parallel to the easy axes of LSMO provide an ideal experimental geometry for probing the influence of interface exchange coupling on the magnetic domain patterns. The observation of unique domain patterns not reported for ferromagnetic metal microstructures, namely divergent antiferromagnetic vortex domains and Z-type domains, suggests the simultaneous presence of spin-flop coupling and local exchange bias in this system.