We investigated magnetic domain structures in granular La 0.6 Sr 0.4 MnO 3 thin films using magnetic force microscopy (MFM) at 78 K. Scanning-mode atomic force microscopy (AFM) resolved individual grains ∼50 nm in diameter, while MFM imaged perpendicular magnetic domains. The magnetic field distribution gradually inverted across the magnetic domain boundaries, and the width of the transition region reached ∼250 nm. We postulate that the grains behave as single domains with either in- or out-of-plane magnetization and that in-plane domains are stabilized near the magnetic domain boundaries.
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Muranaka et al. (2009) studied this question.
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