Direct observation of magnetic vortex behavior in an ordered La0.7Sr0.3MnO3 dot arrays

Literature Information

Publication Date 2016-09-12
DOI 10.1039/C6CP04583A
Impact Factor 3.676
Authors

Zhenghua Li, Dapeng Dong, Dedi Liu, Jia Liu, Dongping Liu, Xiang Li


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Abstract

Directly observing the magnetic domain behavior in patterned nanostructures is crucial to the investigation into advanced spin-based devices. Herein, we show that the magnetic vortex behavior can be deterministically observed and controlled in highly spin polarized La0.7Sr0.3MnO3 (LSMO) triangular dots by successive in-field magnetic force microscopy (MFM). Imaging the magnetic domains with MFM shows that most of the LSMO dots exhibit magnetic vortex states with a clockwise or anticlockwise “pinwheel” structure for decreasing the demagnetization energy. Probing the vortex chirality using in-field MFM indicates that the selective spin circulation of the triangular dots depends on the magnetic orientation of the bias nanomagnet with specially designed geometries. Comparison between measurement and simulation reveals that the vortex behavior should be governed by an interface involved pinning strength at the boundaries, as well as a geometrically induced shape anisotropy of the triangular dot, both of which result in shape-dominated magnetic domain reversals.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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