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Magnetic field induced transitions in the antiferromagnetic layered manganiteLa1.4Sr1.6Mn2O7 were studied using magnetization measurements and ahigh-resolution magneto-optical imaging technique. We report the first directobservation of the formation of ferromagnetic domains appearing at the firstorder spin-flop transition. The magnetization process proceeds throughnucleation of polarized domains at crystal defect sites and not by domain wallmotion. A small magnetic hysteresis is caused by the nucleation andannihilation of domains in the mixed state. These results establish a directlink betweeen the magnetic structure on the atomic scale as seen in neutronscattering and the macroscopic properties of the sample as seen inmagnetization and conductivity measurements.Comment: includes 4 figures, submitted to PR

physical review letters

Direct Imaging of the First-Order Spin-Flop Transition in the Layered Manganite<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>La</mml:mi></mml:mrow><mml:mrow><mml:mn>1.4</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>1.6</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Mn</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow…

Direct Imaging of the First-Order Spin-Flop Transition in the Layered ManganiteLa1.4Sr1.6Mn2