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Dimensionality crossover in vortex dynamics of magnetically coupled F–S–F hybrids

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We report on the vortex dynamics in magnetically coupled F–S–F trilayers extracted from the analysis of the resistance–current isotherms. The superconducting thin film that is conventionally in the 2D vortex limit exhibits quite different behavior when sandwiched between ferromagnetic layers. The value of the dynamic critical exponent strongly increases in the F–S–F case due to screening of the stray vortex field by the adjacent ferromagnetic layers, leading to an effective dimensional crossover in vortex dynamics. Furthermore, the directional pinning by the magnetic stripe domains induces anisotropy in the vortex glass transition temperature and causes metastable avalanche behavior at strong driving currents.

Document Type: Research Article

DOI: http://dx.doi.org/10.1088/0953-2048/24/2/024012

Publication date: February 1, 2011

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