Scattering of a magnetostatic surface spin wave from a one-dimensional step potential in a ferromagnetic film

Balaji, Arjun; Kostylev, Mikhail; Bailleul, Matthieu

doi:10.1063/1.5091806

Cited by 4 publications

(5 citation statements)

References 24 publications

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“…where ˆ( ) exc G x is a Green's function of SW excitation by an external driving field. Its derivation is fully analogous to the one-dimensional cases [36,37]. Equating the denominator of the components of the Fourier transform of ˆ( ) exc G x to zero yields dispersion relations (kx) for the fundamental and the first exchange SW modes.…”

Section: A Micromagnetic Simulationsmentioning

confidence: 97%

“…As shown in Refs. [36][37][38], the problem of scattering of SW from 1D defects can be cast in the form of a Born Equation. The Born Equation is an integral equation for the amplitude of a wave that undergoes scattering from an area (called a "defect" in the present manuscript), where the value of some parameter of the waveguiding medium is different from its value elsewhere.…”

Section: A Micromagnetic Simulationsmentioning

confidence: 99%

“…The inverse Fourier transform of the analytical solution yields two components [36] -the far field in the form of a travelling SW (23) and the near field of the excitation source. No exact solution for the near field exists; but approximate solutions can be obtained for both MSSW and BVMSW cases in the form of combinations of exponents of complex arguments and exponential integrals [36,37]. Alternatively, the inverse Fourier transform can be carried out numerically on the same mesh.…”

Section: A Micromagnetic Simulationsmentioning

confidence: 99%

“…In addition, the first volume mode (VM) that is quantized over the thickness of the films is shown with green color. Due to the rather small thickness of the films, the contribution of the exchange energy to the energy of the SWs is large enough to open up a gap between the fundamental mode and the VMs, leading to the absence of any direct mode crossing or hybridizations [21,25,37]. Note that this gap will be even larger for thinner films.…”

Section: A Comparison Of Mssw and Bvmswmentioning

confidence: 99%

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Controlling the propagation of dipole-exchange spin waves using local inhomogeneity of the anisotropy

et al. 2020

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Spin waves are promising candidates to carry, transport and process information. Controlling the propagation characteristics of spin waves in magnetic materials is an essential ingredient for designing spin-wave based computing architectures. Here, we study the influence of surface inhomogeneities on the spin wave signals transmitted through thin films. We use micromagnetic simulations to study the spin-wave dynamics in an in-plane magnetized yttrium iron garnet thin film with thickness in the nanometre range in the presence of surface defects in the form of locally introduced uniaxial anisotropies. These defects are used to demonstrate that the Backward Volume Magnetostatic Spin Waves (BVMSW) are more responsive to backscattering in comparison to Magnetostatic Surface Spin Waves (MSSWs). For this particular defect type, the reason for this behavior can be quantitatively related to the difference in the magnon band structures for the two types of spin waves. To demonstrate this, we develop a quasi-analytical theory for the scattering process. It shows an excellent agreement with the micromagnetic simulations, sheds light on the backscattering processes, and provides a new way to analyze the spin-wave transmission rates in the presence of surface inhomogeneities in sufficiently thin films, for which the role of exchange energy in the spin wave dynamics is significant. Our study paves the way to designing magnonic logic devices for data processing which rely on a designed control of spin-wave transmission. B. Original Born-Equation based model of spin wave scattering from 2D defectsthe mesh cell size.) This converts the tensor into a matrix  with elements ij. Then the right-hand side of ( 22) is obtained by acting with ˆ( ) exc G x on an assumed localised excitation source. The source is located at

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Section: A Micromagnetic Simulationsmentioning

confidence: 97%

Section: A Micromagnetic Simulationsmentioning

confidence: 99%

Section: A Micromagnetic Simulationsmentioning

confidence: 99%

Section: A Comparison Of Mssw and Bvmswmentioning

confidence: 99%

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Controlling the propagation of dipole-exchange spin waves using local inhomogeneity of the anisotropy

et al. 2020

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“…In China, research on the behavior of ferromagnetic materials is advancing, particularly in the field of electronics and telecommunications. For example, a study by Li (2019) investigated the magnetic properties of ferromagnetic thin films for use in magnetic sensors and data storage devices. Through careful analysis of the magnetic susceptibility and hysteresis loop characteristics, the researchers aimed to optimize the performance and reliability of these devices.…”

Section: Introductionmentioning

confidence: 99%

Analyzing the Effect of Magnetic Field Strength on the Behavior of Ferromagnetic Materials in United States

Wilson

2024

AJPS

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Purpose: The aim of the study was to analyzing the effect of magnetic field strength on the behavior of ferromagnetic materials in United States. Methodology: This study adopted a desk methodology. A desk study research design is commonly known as secondary data collection. This is basically collecting data from existing resources preferably because of its low cost advantage as compared to a field research. Our current study looked into already published studies and reports as the data was easily accessed through online journals and libraries. Findings: In the United States show that magnetic field strength affects the behavior of ferromagnetic materials by inducing structural changes, influencing lattice distortions and phase transformations. These findings deepen our understanding of magneto structural coupling, aiding material design. Additionally, research on magnetostriction behavior highlights the interplay between field strength, microstructure, and response. Unique Contribution to Theory, Practice and Policy: Domain theory, stoner-wohlfarth model & micro magnetic theory may be used to anchor future studies on magnetic field strength on the behavior of ferromagnetic materials. Conduct systematic experimental studies to validate theoretical predictions and elucidate the practical implications of magnetic field effects on material behavior. Governments and funding agencies should allocate resources to support research infrastructure for studying magnetic materials and phenomena.

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Spin-waves generation at the thickness step of yttrium iron garnet film

Vysotskiǐ

Садовников

Dudko

et al. 2020

Applied Physics Letters

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We report on the experimental observation of short, exchange-dominated spin waves (EDSW) generation by a thickness step in the ferrite waveguide under microwave pumping. This effect was explored both experimentally (using mirco-Brillouin light scattering technique) and theoretically (by micromagnetic simulation) for the sample magnetized along the step and for two cases of pumping: a uniform microwave pumping of the step and its pumping through a magnetostatic surface wave (MSSW) traveling across the step. It was shown that efficiency of EDSW generation caused by MSSW scattering on the thickness step increases with the frequency (or wave number) while for the case of the uniform pumping, the generation efficiency demonstrates the opposite behavior.

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Scattering of a magnetostatic surface spin wave from a one-dimensional step potential in a ferromagnetic film

Cited by 4 publications

References 24 publications

Controlling the propagation of dipole-exchange spin waves using local inhomogeneity of the anisotropy

Controlling the propagation of dipole-exchange spin waves using local inhomogeneity of the anisotropy

Analyzing the Effect of Magnetic Field Strength on the Behavior of Ferromagnetic Materials in United States

Spin-waves generation at the thickness step of yttrium iron garnet film

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