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We theoretically study Josephson vortex structures in Josephson junctionswhich have multiple tunneling channels caused by multiple superconducting gaps.Deriving "coupled sine-Gordon equations" from the free-energy taking account ofthe multiple tunneling channels, we examine two typical situations, a heteroticjunction composed of multigap-superconductor, insulator, and single-gapsuperconductor, and a grain-boundary junction formed by two identical multigapsuperconductors. Then, we reveal in both situations that the magnetic fielddistribution of the Josephson vortex for $\pm s$-wave superconductivity is moreenlarged than that for s-wave without sign change between the order parameters.Its mechanism is ascribed to a cancellation of the multiple Josephson currents.We display such an anomalous Josephson vortex and suggest how to evaluate theenlargement.

Theory of vortex structure in Josephson junctions with multiple tunneling channels: Vortex enlargement as a probe of $\pm s$-wave superconductivity