title: Real-space observation of helical spin order.
abstract: Helical spin order in magnetic materials has been investigated only in reciprocal space. We visualized the helical spin order and dynamics in a metal silicide in real space by means of Lorentz electron microscopy. The real space of the helical spin order proves to be much richer than that expected from the averaged structure; it exhibits a variety of magnetic defects similar to atomic dislocations in the crystal lattice. The application of magnetic fields allows us to directly observe the deformation processes of the helical spin order accompanied by nucleation, movement, and annihilation of the magnetic defects.
authors.affiliation: Spin SuperStructure Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology Agency (JST), Tsukuba 305-8562, Japan. uchida.masaya@aist.go.jp
authors.forename: Masaya
authors.initials: M
authors.lastname: Uchida
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Onose
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Matsui
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Tokura