title: Direct observation and imaging of a spin-wave soliton with p-like symmetry.
abstract: Spin waves, the collective excitations of spins, can emerge as nonlinear solitons at the nanoscale when excited by an electrical current from a nanocontact. These solitons are expected to have essentially cylindrical symmetry (that is, s-like), but no direct experimental observation exists to confirm this picture. Using a high-sensitivity time-resolved magnetic X-ray microscopy with 50 ps temporal resolution and 35 nm spatial resolution, we are able to create a real-space spin-wave movie and observe the emergence of a localized soliton with a nodal line, that is, with p-like symmetry. Micromagnetic simulations explain the measurements and reveal that the symmetry of the soliton can be controlled by magnetic fields. Our results broaden the understanding of spin-wave dynamics at the nanoscale, with implications for the design of magnetic nanodevices.
authors.affiliation: Department of Physics, Stanford University, Stanford, California 94305, USA.|Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA.
authors.forename: S
authors.identifier: http://orcid.org/0000-0001-9352-2411
authors.initials: S
authors.lastname: Bonetti
authors.affiliation: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA.|Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA.
authors.forename: R
authors.initials: R
authors.lastname: Kukreja
authors.affiliation: Department of Physics, Stanford University, Stanford, California 94305, USA.|Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA.
authors.forename: Z
authors.initials: Z
authors.lastname: Chen
authors.affiliation: Grup de Magnetisme, Departament de Física Fonamental, Universitat de Barcelona, Barcelon 08028, Spain.
authors.forename: F
authors.initials: F
authors.lastname: Macià
authors.affiliation: Grup de Magnetisme, Departament de Física Fonamental, Universitat de Barcelona, Barcelon 08028, Spain.
authors.forename: J M
authors.initials: JM
authors.lastname: Hernàndez
authors.affiliation: Integrated Devices and Circuits, School of Information and Communication Technology, KTH Royal Institute of Technology, Kista 16440, Sweden.
authors.forename: A
authors.initials: A
authors.lastname: Eklund
authors.affiliation: Department of Physics, New York University, 4 Washington Place, New York, New York 10003, USA.
authors.forename: D
authors.initials: D
authors.lastname: Backes
authors.affiliation: Advanced Instrumentation for Research Division, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA.
authors.forename: J
authors.initials: J
authors.lastname: Frisch
authors.affiliation: HGST, a Western Digital Company, 3403 Yerba Buena Road, San Jose, California 95135, USA.
authors.forename: J
authors.initials: J
authors.lastname: Katine
authors.affiliation: Integrated Devices and Circuits, School of Information and Communication Technology, KTH Royal Institute of Technology, Kista 16440, Sweden.
authors.forename: G
authors.identifier: http://orcid.org/0000-0001-6459-749X
authors.initials: G
authors.lastname: Malm
authors.affiliation: Department of Physics, Emory University, 201 Dowman Drive, Atlanta, Georgia 30322, USA.
authors.forename: S
authors.initials: S
authors.lastname: Urazhdin
authors.affiliation: Department of Physics, New York University, 4 Washington Place, New York, New York 10003, USA.
authors.forename: A D
authors.initials: AD
authors.lastname: Kent
authors.affiliation: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA.
authors.forename: J
authors.initials: J
authors.lastname: Stöhr
authors.affiliation: Stanford Synchrotron Radiation Laboratory, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA.
authors.forename: H
authors.initials: H
authors.lastname: Ohldag
authors.affiliation: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA.
authors.forename: H A
authors.initials: HA
authors.lastname: Dürr