Saturation of attenuation length of spin waves in thick permalloy films

Ota, Masaki; Yamanoi, Kazuto; Kasai, S.; Mitani, Seiji; Manago, Takashi

doi:10.7567/jjap.54.113001

Cited by 6 publications

(11 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nevertheless, Gaussian fitting has been widely used and practically beneficial for the experimental analysis of wave packet amplitude or peak measurements. 24 We used Gaussian fitting for our simulated results in order to perform the same analysis and to be consistent with the experimental results in Ref. 24.…”

Section: Simulation Proceduresmentioning

confidence: 94%

“…This is based on our experimental setup and sample Journal of Applied Physics dimensions described in Ref. 24, where the width of the structure in the z-direction (Py film and antenna) is much larger than the other dimensions in the system. This permits the simplification of Eq.…”

Section: Simulation Proceduresmentioning

confidence: 99%

“…In the experimental arrangement in Ref. 24, a sufficiently strong saturating field H z is applied across the Py film in the z-direction as indicated in Fig. 2.…”

Section: Simulation Proceduresmentioning

confidence: 99%

“…In our previous paper on MSSW in Py, however, thicker waveguides showed a higher measured group velocity for the spin waves, but without a significant increase in their decay length. 24 Figure 1(a) shows typical measured magnetization waveforms for Py films of various thicknesses measured using a detection antenna 20 μm away from the excitation antenna. Shorter arrival time is observed for the thicker films, and the group velocity increases with Py thickness, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…In order to investigate the effects of the electrical conductivity on the group velocity and decay length, we performed combined electromagnetic-micromagnetic simulations incorporating the electrical conductivity of the magnetic film and compared the results with our previous experimental measurements on Py waveguides. 24…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Influence of the conductivity on spin wave propagation in a Permalloy waveguide

Manago

Aziz

Ogrin

et al. 2019

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

The influence of the electrical conductivity of a Permalloy waveguide on the spin wave propagation was investigated using the finite-element solution of the combined system of quasistatic electromagnetic potential and linearized LLG (Landau-Lifshitz-Gilbert) equations. The difference in the group velocity between the conductive and nonconductive waveguides becomes large for films over 300 nm thick, and the difference is very small for film thicknesses less than 100 nm. The observed enhancement of the group velocity with increasing film thickness is attributed to the damping caused by the electrical conductivity, which leads to narrowing of the spin wave packet envelope and shorter arrival times of propagating waves. The basic characteristics of the dispersion relations do not change between conductive and nonconductive films for small film thicknesses less than 300 nm. The simulated dispersion relations indicate shift of their maximum intensity toward lower wavenumbers and, therefore, increase in the group velocity with increasing thickness. The simulated decay length of the spin waves for conductive films initially increases but then decreases with increasing thickness, which agrees well with the experimental results. The extracted damping coefficients from both simulations and the experiment agree very well and increase proportionally with d 2 , where d is the film thickness, due to the additional eddy current damping. The observed thickness and conductivity dependence of spin wave propagation is crucial for magnonics research and toward the development of future spin wave devices using metal films.

show abstract

Section: Simulation Proceduresmentioning

confidence: 94%

Section: Simulation Proceduresmentioning

confidence: 99%

“…In the experimental arrangement in Ref. 24, a sufficiently strong saturating field H z is applied across the Py film in the z-direction as indicated in Fig. 2.…”

Section: Simulation Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of the conductivity on spin wave propagation in a Permalloy waveguide

Manago

Aziz

Ogrin

et al. 2019

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

show abstract

Direct Observation of Propagating Spin Waves in the 2D van der Waals Ferromagnet Fe₅GeTe₂

Schulz,

Litzius,

Powalla

et al. 2023

Nano Lett.

View full text Add to dashboard Cite

Magnetism in reduced dimensionalities is of great fundamental interest while also providing perspectives for applications of materials with novel functionalities. In particular, spin dynamics in two dimensions (2D) have become a focus of recent research. Here, we report the observation of coherent propagating spin-wave dynamics in a ∼30 nm thick flake of 2D van der Waals ferromagnet Fe5GeTe2 using X-ray microscopy. Both phase and amplitude information were obtained by direct imaging below T C for frequencies from 2.77 to 3.84 GHz, and the corresponding spin-wave wavelengths were measured to be between 1.5 and 0.5 μm. Thus, parts of the magnonic dispersion relation were determined despite a relatively high magnetic damping of the material. Numerically solving an analytic multilayer model allowed us to corroborate the experimental dispersion relation and predict the influence of changes in the saturation magnetization or interlayer coupling, which could be exploited in future applications by temperature control or stacking of 2D-heterostructures.

show abstract

Ferromagnetic-waveguide width dependence of propagation properties for magnetostatic surface spin waves

2021

View full text Add to dashboard Cite

The width dependence of propagation properties for magnetostatic surface spin waves (MSSWs) in Permalloy (Py) waveguides was investigated experimentally and numerically. When both the short-side width of a Py waveguide (WPy) and the magnetic field (μ0H) were large enough, the spin wave (SW) intensity almost linearly decreased with decreasing WPy, and the resonant frequency fr was almost independent of WPy. However, when both WPy and μ0H were small, the SW intensity rapidly reduced, and fr decreased with decreasing WPy. Micromagnetic simulations revealed that when both WPy and μ0H are large enough, the magnetization direction of Py is almost parallel to the magnetic field direction, and the SW mode becomes the MSSW mode. In contrast, when both WPy and μ0H are small, magnetization direction tilts to the long-side direction of the Py strip from the magnetic field direction due to a strong demagnetizing field, which is the origin of the unexpected reduction in the intensity and fr. When miniaturized ferromagnetic waveguides are used for shrinking MSSW devices, a sufficiently large magnetic field is necessary because the influence of the shape magnetic anisotropy cannot be ignored.

show abstract

Saturation of attenuation length of spin waves in thick permalloy films

Cited by 6 publications

References 19 publications

Influence of the conductivity on spin wave propagation in a Permalloy waveguide

Influence of the conductivity on spin wave propagation in a Permalloy waveguide

Direct Observation of Propagating Spin Waves in the 2D van der Waals Ferromagnet Fe₅GeTe₂

Ferromagnetic-waveguide width dependence of propagation properties for magnetostatic surface spin waves

Contact Info

Product

Resources

About

Saturation of attenuation length of spin waves in thick permalloy films

Cited by 6 publications

References 19 publications

Influence of the conductivity on spin wave propagation in a Permalloy waveguide

Influence of the conductivity on spin wave propagation in a Permalloy waveguide

Direct Observation of Propagating Spin Waves in the 2D van der Waals Ferromagnet Fe5GeTe2

Ferromagnetic-waveguide width dependence of propagation properties for magnetostatic surface spin waves

Contact Info

Product

Resources

About

Direct Observation of Propagating Spin Waves in the 2D van der Waals Ferromagnet Fe₅GeTe₂