title: Stabilization of magnetic helix in exchange-coupled thin films.
abstract: Based on micromagnetic simulations, we report on a novel magnetic helix in a soft magnetic film that is sandwiched between and exchange-coupled to two hard magnetic layers with different anisotropies. We show that such a confined helix stays stable without the presence of an external magnetic field. The magnetic stability is determined by the energy minimization and is a result of an internal magnetic field created by the exchange interaction. We show that this internal field stores a magnetic energy density of a few kJ/m(3). We also find that it dramatically modifies ferromagnetic resonances, such that the helix can be used as a ferromagnetic resonance filter and a fast acting attenuator.
authors.affiliation: The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany.|Deutsches Elektronen-Synchrotron, Notkestraβe 85, 22607 Hamburg, Germany.
authors.forename: L V
authors.initials: LV
authors.lastname: Dzemiantsova
authors.affiliation: The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany.|Max-Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany.|Center for Free-Electron Laser Science, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Meier
authors.affiliation: The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany.|Deutsches Elektronen-Synchrotron, Notkestraβe 85, 22607 Hamburg, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Röhlsberger