Skyrmion‐Excited Spin‐Wave Fractal Networks

Tang, Nan; Liyanage, W. C.; Montoya, Sergio A.; Patel, Sheena; Quigley, Lizabeth J.; Grutter, Alexander J.; Fitzsimmons, Michael R.; Sinha, Sunil; Borchers, Julie A.; Fullerton, Eric E.; DeBeer‐Schmitt, Lisa; Gilbert, Dustin A.

doi:10.1002/adma.202300416

Title: Skyrmion‐Excited Spin‐Wave Fractal Networks

Journal Article · Sun Jun 25 00:00:00 EDT 2023 · Advanced Materials

DOI:https://doi.org/10.1002/adma.202300416· OSTI ID:1997772

Tang, Nan ^[1]; Liyanage, W. C. ^[1];

^[2]; Patel, Sheena ^[3]; Quigley, Lizabeth J. ^[1];

^[4];

^[5]; Sinha, Sunil ^[6];

^[4];

^[7];

^[8];

^[5]

Univ. of Tennessee, Knoxville, TN (United States)
Univ. of California, San Diego, CA (United States). Center for Memory and Recording Research; Naval Information Warfare Center, San Diego, CA (United States)
Univ. of California, San Diego, CA (United States). Center for Memory and Recording Research; Univ. of California, San Diego, CA (United States). Physics Dept.
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Univ. of California, San Diego, CA (United States). Dept. of Physics
Univ. of California, San Diego, CA (United States). Center for Memory and Recording Research; Univ. of California, San Diego, CA (United States). Dept. of Electrical and Computer Engineering
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Magnetic skyrmions exhibit unique, technologically relevant pseudo-particle behaviors which arise from their topological protection, including well-defined, 3D dynamic modes that occur at microwave frequencies. During dynamic excitation, spin waves are ejected into the interstitial regions between skyrmions, creating the magnetic equivalent of a turbulent sea. However, since the spin waves in these systems have a well-defined length scale, and the skyrmions are on an ordered lattice, ordered structures from spin-wave interference can precipitate from the chaos. This work uses small-angle neutron scattering (SANS) to capture the dynamics in hybrid skyrmions and investigate the spin-wave structure. Performing simultaneous ferromagnetic resonance and SANS, the diffraction pattern shows a large increase in low-angle scattering intensity, which is present only in the resonance condition. This scattering pattern is best fit using a mass fractal model, which suggests the spin waves form a long-range fractal network. The fractal structure is constructed of fundamental units with a size that encodes the spin-wave emissions and are constrained by the skyrmion lattice. These results offer critical insights into the nanoscale dynamics of skyrmions, identify a new dynamic spin-wave fractal structure, and demonstrate SANS as a unique tool to probe high-speed dynamics.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR)

Grant/Contract Number:: AC05-00OR22725; SC0021344; DMR- 2010792

OSTI ID:: 1997772

Journal Information:: Advanced Materials, Vol. 35, Issue 33; ISSN 0935-9648

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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