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Bonetti, S; Kukreja, R; Chen, Z; Macià, F; Hernàndez, J M; Eklund, A; Backes, D; Frisch, J; Katine, J; Malm, G; Urazhdin, S; Kent, A D; Stöhr, J; Ohldag, H; Dürr, H A
Nature communications, 11/2015, Volume: 6, Issue: 1Journal Article
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.
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