Dissipation characteristics of quantized spin waves in nano-scaled magnetic ring structures

  title={Dissipation characteristics of quantized spin waves in nano-scaled magnetic ring structures},
  author={Helmut Schultheiss and C. W. Sandweg and Bjorn Obry and Sebastian J. Hermsdoerfer and S. Schaefer and Britta Leven and Burkard Hillebrands},
  journal={Journal of Physics D},
The spatial profiles and the dissipation characteristics of spin-wave quasi-eigenmodes are investigated in small magnetic Ni81Fe19 ring structures using Brillouin light scattering microscopy. It is found that the decay constant of a mode decreases with increasing mode frequency. 

Figures from this paper

Linear and nonlinear collective modes in magnetic microstructures formed by coupled disks
We have experimentally studied the collective spin-wave modes in microscopic magnetic structures formed by Permalloy disks, connected to each other by nanobridges. By using Brillouin light-scattering
Width dependent transition of quantized spin-wave modes in Ni80Fe20 square nanorings
We investigated optically induced ultrafast magnetization dynamics in square shaped Ni80Fe20 nanorings with varying ring width. Rich spin-wave spectra are observed whose frequencies showed a strong
Broadband ferromagnetic resonance spectroscopy of permalloy triangular nanorings
We investigate the spin dynamics in triangular shaped permalloy rings using broadband ferromagnetic resonance spectroscopy. Compared with circular rings, we observed multiple resonance frequency
Micro-focused Brillouin light scattering: imaging spin waves at the nanoscale
Spin waves constitute an important part of research in the field of magnetization dynamics. Spin waves are the elementary excitations of the spin system in a magnetically ordered material state and
Large amplitude magnetization dynamics and the suppression of edge modes in a single nanomagnet
Large amplitude magnetization dynamics of a single square nanomagnet have been studied by time-resolved Kerr microscopy. Experimental spectra revealed that only a single mode was excited for all bias
Chapter Two - Application of Microfocused Brillouin Light Scattering to the Study of Spin Waves in Low-Dimensional Magnetic Systems
Abstract In this chapter, the basics of microfocused Brillouin light scattering from spin waves are reviewed. The focus is on the details of the experimental setup, its performances and
Bottom up Magnonics: Magnetization Dynamics of Individual Nanomagnets
A review is provided of recent time-resolved scanning Kerr microscopy experiments and micromagnetic simulations of magnetization dynamics in single nanomagnets, and in pairs of dipolar coupled
Calculations of three-dimensional magnetic excitations in permalloy nanostructures with vortex state
Abstract Dynamic susceptibility spectra of the vortex state in nanorings and nanodots are studied using three-dimensional micromagnetic simulations. Spatial maps of the susceptibility have enabled
Review and prospects of magnonic crystals and devices with reprogrammable band structure.
  • M. Krawczyk, D. Grundler
  • Physics, Medicine
    Journal of physics. Condensed matter : an Institute of Physics journal
  • 2014
This topical review addresses materials with a periodic modulation of magnetic parameters that give rise to artificially tailored band structures and allow unprecedented control of spin waves in microand nanostructured ferromagnetic materials.
Magnetization Dynamics.
Magnetism primarily describes the physics and materials science of systems presenting a magnetization -- a macroscopic order parameter characterizing electron angular momentum. The order parameter is


Spin wave wells in nonellipsoidal micrometer size magnetic elements.
It is shown that in finite, nonellipsoidal, micrometer size magnetic thin film elements the dynamic magnetic eigenexcitations (spin waves) may exhibit strong spatial localization.
Observation of coherence and partial decoherence of quantized spin waves in nanoscaled magnetic ring structures.
Experiments and simulations are reported, which demonstrate the influence of partial decoherence of spin-wave modes on the dynamics in small magnetic structures, and a continuous frequency variation with position is observed which is well reproduced byspin-wave calculations and micromagnetic simulations.
Splitting of spin excitations in nanometric rings induced by a magnetic field.
A Brillouin light scattering investigation of the eigenmode spectrum of nanometric permalloy rings as a function of the applied magnetic field, using the dynamical matrix approach to calculate the whole set of eigenvectors and eigenvalues of the system.
Micromagnetic phase transitions and spin wave excitations in a ferromagnetic stripe.
Magnetic excitations of micrometer-wide ferromagnetic stripes subjected to a transverse applied field have been measured and this one is modeled analytically and numerically, which allows one to distinguish two micromagnetic phases governing the ground state.
Lateral quantization of spin waves in micron size magnetic wires
We report on the observation of quantized surface spin waves in periodic arrays of magnetic Ni81Fe19 wires by means of Brillouin light scattering spectroscopy. At small wavevectors (q_1 = 0 -
Radiation of spin waves by a single micrometer-sized magnetic element
Dynamic magnetic properties of a single micrometer-sized magnetic element consisting of a permalloy and a partially patterned CoFe layer separated by an intervening Cu spacer layer have been studied
Hysteresis and control of ferromagnetic resonances in rings
The spin dynamics in narrow ferromagnetic rings is studied in the frequency range from 45MHzto20GHz at room temperature. Our broadband spectrometer allows us to monitor the ferromagnetic resonance of
Brillouin light scattering studies of confined spin waves: linear and nonlinear confinement
This review is devoted to both the experimental and theoretical aspects of lateral con"nement e!ects observed for spin waves, with the wavevector in the 10}10 cm range, where the magnetic dipole
Excitations with negative dispersion in a spin vortex
Micron-sized ferromagnetic permalloy disks having an in-plane vortexlike configuration are excited by a fast-rise-time magnetic-field pulse perpendicular to the plane. The excited modes are imaged
Spin-wave eigenmodes of permalloy squares with a closure domain structure.
Quantized spin-wave eigenmodes in single, 16 nm thick and 0.75 to 4 mum wide square permalloy islands with a fourfold closure domain structure have been investigated by microfocus Brillouin light