Mapping the magnonic landscape in patterned magnetic structures
arXiv:1706.03212 · doi:10.1103/PhysRevB.96.094430
Abstract
We report the development of a hybrid numerical / analytical model capable of mapping the spatially-varying distributions of the local ferromagnetic resonance (FMR) frequency and dynamic magnetic susceptibility in a wide class of patterned and compositionally modulated magnetic structures. Starting from the numerically simulated static micromagnetic state, the magnetization is deliberately deflected orthogonally to its equilibrium orientation, and the magnetic fields generated in response to this deflection are evaluated using micromagnetic software. This allows us to calculate the elements of the effective demagnetizing tensor, which are then used within a linear analytical formalism to map the local FMR frequency and dynamic magnetic susceptibility. To illustrate the typical results that one can obtain using this model, we analyze three micromagnetic systems boasting non-uniformity in either one or two dimensions, and successfully explain the spin-wave emission observed in each case, demonstrating the ubiquitous nature of the Schlömann excitation mechanism underpinning the observations. Finally, the developed model of local FMR frequency could be used to explain how spin waves could be confined and steered using magnetic non-uniformities of various origins, rendering it a powerful tool for the mapping of the graded magnonic index in magnonics.
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- Nanoscale X-Ray Imaging of Spin Dynamics in Yttrium Iron Garnet
- Influence of nonmagnetic dielectric spacers on the spin wave response of one-dimensional planar magnonic crystals
- Local non-linear excitation of sub-100 nm bulk-type spin waves by edge-localized spin waves in magnetic films
- Dynamics of Spiral Spin Waves in Magnetic Nano-patches: Influence of Thickness and Shape
- Suppression of the skyrmion Hall effect in synthetic ferrimagnets with gradient magnetization
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- Controlling selection rules for magnon scattering in nanomagnets by spatial symmetry breaking
- Time-domain imaging of curling modes in a confined magnetic vortex and a micromagnetic study exploring the role of spiral spin waves emitted by the core
- Scattering of exchange spin waves from regions of modulated magnetization