Direct observation and imaging of a spin-wave soliton with p-like symmetry

S. Bonetti (), R. Kukreja, Z. Chen, F. Macià, J. M. Hernàndez, A. Eklund, D. Backes, J. Frisch, J. Katine, G. Malm, S. Urazhdin, A. D. Kent, J. Stöhr, H. Ohldag and H. A. Dürr ()
Additional contact information
S. Bonetti: Stanford University
R. Kukreja: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
Z. Chen: Stanford University
F. Macià: Grup de Magnetisme, Departament de Física Fonamental, Universitat de Barcelona
J. M. Hernàndez: Grup de Magnetisme, Departament de Física Fonamental, Universitat de Barcelona
A. Eklund: Integrated Devices and Circuits, School of Information and Communication Technology, KTH Royal Institute of Technology
D. Backes: New York University
J. Frisch: SLAC National Accelerator Laboratory
J. Katine: HGST, a Western Digital Company
G. Malm: Integrated Devices and Circuits, School of Information and Communication Technology, KTH Royal Institute of Technology
S. Urazhdin: Emory University
A. D. Kent: New York University
J. Stöhr: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
H. Ohldag: Stanford Synchrotron Radiation Laboratory, SLAC National Accelerator Laboratory
H. A. Dürr: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms9889

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