DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Correlated spin-wave generation and domain-wall oscillation in a topologically textured magnetic film

Journal Article · · Nature Materials
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [5];  [6];  [2]; ORCiD logo [1]
  1. Brookhaven National Laboratory (BNL), Upton, NY (United States); Stony Brook University, NY (United States)
  2. University of California, San Diego, CA (United States)
  3. Brookhaven National Laboratory (BNL), Upton, NY (United States)
  4. Stanford University, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
  5. Brookhaven National Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
  6. Euclid Techlabs LLC, Bolingbrook, IL (United States)

Spin waves, or magnons, are essential for next-generation energy-efficient spintronics and magnonics. Yet, visualizing spin-wave dynamics at nanoscale and microwave frequencies remains a formidable challenge due to the lack of spin-sensitive, time-resolved microscopy. Here, in this study, we report a breakthrough in imaging dipole-exchange spin waves in a ferromagnetic film owing to the development of laser-free ultrafast Lorentz electron microscopy, which is equipped with a microwave-mediated electron pulser for high spatiotemporal resolution. Using topological spin textures, we captured the emission, propagation, reflection and interference of spin waves from spin anti-vortices under radio-frequency excitations. Remarkably, we show that spin-wave generation is closely tied to the oscillatory motion of specific magnetic domain walls, providing the missing link between wave emission and wall dynamics near magnetic singularities. This work opens new possibilities in magnonics, offering a nanoscopic view of spin dynamics via transmission electron microscopy and enabling controlled excitation via radio-frequency fields for exploring non-equilibrium states in magnetic and multiferroic systems.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Office of SBIR/STTR Programs (SBIR/STTR)
Grant/Contract Number:
SC0012704; SC0013121
OSTI ID:
2563039
Report Number(s):
BNL--228075-2025-JAAM
Journal Information:
Nature Materials, Journal Name: Nature Materials Journal Issue: 3 Vol. 24; ISSN 1476-1122
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

References (50)

Control of Double-Vortex Domain Configurations in a Shape-Engineered Trilayer Nanomagnet System journal January 2010
Optically Inspired Nanomagnonics with Nonreciprocal Spin Waves in Synthetic Antiferromagnets journal January 2020
The building blocks of magnonics journal October 2011
Magnetic texture based magnonics journal April 2021
Quantum magnonics: When magnon spintronics meets quantum information science journal June 2022
On the transport of intensity technique for phase retrieval journal December 2004
GHz laser-free time-resolved transmission electron microscopy: A stroboscopic high-duty-cycle method journal February 2016
Ultrafast transmission electron microscopy using a laser-driven field emitter: Femtosecond resolution with a high coherence electron beam journal May 2017
Tunable electron beam pulser for picoseconds stroboscopic microscopy in transmission electron microscopes journal December 2019
Stroboscopic ultrafast imaging using RF strip-lines in a commercial transmission electron microscope journal May 2022
Characterization of transverse electron pulse trains using RF powered traveling wave metallic comb striplines journal July 2023
Spin-Wave Emission from Vortex Cores under Static Magnetic Bias Fields journal February 2021
4D Lorentz Electron Microscopy Imaging: Magnetic Domain Wall Nucleation, Reversal, and Wave Velocity journal September 2010
Realization of a spin-wave multiplexer journal April 2014
Magnon transistor for all-magnon data processing journal August 2014
Magnetic nano-oscillator driven by pure spin current journal October 2012
Magnetic domain walls as reconfigurable spin-wave nanochannels journal February 2016
Magnetic vortex cores as tunable spin-wave emitters journal July 2016
Spin waves and magnetic exchange interactions in CaFe2As2 journal July 2009
Magnon spintronics journal June 2015
Atomic resolution electron microscopy in a magnetic field free environment journal May 2019
Emission and propagation of 1D and 2D spin waves with nanoscale wavelengths in anisotropic spin textures journal February 2019
Coherent magnon-induced domain-wall motion in a magnetic insulator channel journal June 2023
Advances in coherent magnonics journal July 2021
Single shot acquisition of spatially resolved spin wave dispersion relations using X-ray microscopy journal October 2020
Few-nm tracking of current-driven magnetic vortex orbits using ultrafast Lorentz microscopy journal February 2020
FastMag: Fast micromagnetic simulator for complex magnetic structures (invited) journal April 2011
Nanoconstriction-based spin-Hall nano-oscillator journal October 2014
Coulomb interactions in high-coherence femtosecond electron pulses from tip emitters journal January 2019
Laser-free GHz stroboscopic transmission electron microscope: Components, system integration, and practical considerations for pump–probe measurements journal February 2020
Four-dimensional ultrafast electron microscopy journal May 2005
A magnon scattering platform journal June 2021
Theory of dipole-exchange spin wave spectrum for ferromagnetic films with mixed exchange boundary conditions journal December 1986
The dipole-exchange spin wave spectrum for anisotropic ferromagnetic films with mixed exchange boundary conditions journal December 1990
The 2021 Magnonics Roadmap journal March 2021
Nonlinear Emission of Spin-Wave Caustics from an Edge Mode of a Microstructured Co 2 Mn 0.6 Fe 0.4 Si Waveguide journal February 2013
Coherent Excitation of Heterosymmetric Spin Waves with Ultrashort Wavelengths journal March 2019
Quantification of Mixed Bloch-Néel Topological Spin Textures Stabilized by the Dzyaloshinskii-Moriya Interaction in Co / Pd Multilayers journal June 2019
Spin Wave Wells in Nonellipsoidal Micrometer Size Magnetic Elements journal January 2002
Spin Wave Dynamics and the Determination of Intrinsic Damping in Locally Excited Permalloy Thin Films journal February 2007
Pinning and gyration dynamics of magnetic vortices revealed by correlative Lorentz and bright-field imaging journal January 2022
Imaging the Ultrafast Coherent Control of a Skyrmion Crystal journal December 2022
Proposal for a Standard Micromagnetic Problem: Spin Wave Dispersion in a Magnonic Waveguide journal January 2013
Reconfigurable nanoscale spin-wave directional coupler journal January 2018
Direct visualization of electromagnetic wave dynamics by laser-free ultrafast electron microscopy journal October 2020
Nano-to-micro spatiotemporal imaging of magnetic skyrmion’s life cycle journal June 2021
Coherent ultrafast photoemission from a single quantized state of a one-dimensional emitter journal October 2023
Four-Dimensional Electron Microscopy journal April 2010
Frequency multiplication by collective nanoscale spin-wave dynamics journal March 2022
Magnonics: a new research area in spintronics and spin wave electronics journal October 2015