title: Observation of magnetic ripple and nanowidth domains in a layered ferromagnet.
abstract: We investigated ferromagnetic domain structures on nanometer to micrometer scale for single crystals of a layered ferromagnet, La(2-2x)Sr(1+2x)Mn2O7 (0.32 < or = x < or = 0.40), as functions of x and temperature by means of Lorentz electron microscopy. We have succeeded in observing the evolution of magnetic ripple structure, dynamically, related to a spin reorientation transition where the magnetization direction switches between parallel and perpendicular to the layers. Our high-resolution magnetic domain imaging revealed that the ripple state is characterized by the evolution of magnetic nanowidth domains.
authors.affiliation: High Voltage Electron Microscopy Station, National Institute for Materials Science, Tsukuba 305-0044, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Asaka
authors.forename: T
authors.initials: T
authors.lastname: Kimura
authors.forename: T
authors.initials: T
authors.lastname: Nagai
authors.forename: X Z
authors.initials: XZ
authors.lastname: Yu
authors.forename: K
authors.initials: K
authors.lastname: Kimoto
authors.forename: Y
authors.initials: Y
authors.lastname: Tokura
authors.forename: Y
authors.initials: Y
authors.lastname: Matsui