Spin Wave Dynamics in Ferromagnetic Films
Summary
Spin waves are collective oscillations of magnetic moments in ordered ferromagnets, propagating through thin films as quantised quasiparticles known as magnons. The dispersion of these waves is governed by a combination of long-range dipolar interactions and short-range exchange coupling, giving rise to distinct modes such as the Damon–Eschbach surface wave and backward-volume magnetostatic modes. Film thickness, magnetic anisotropy, boundary conditions and interfacial exchange all shape the spin-wave spectrum, while intrinsic and extrinsic damping mechanisms determine the propagation length and coherence. Experimental techniques including ferromagnetic resonance (FMR), Brillouin light scattering and inductive microwave spectroscopy permit direct characterisation of frequency, group velocity, linewidth and nonreciprocal behaviour. Theoretical advances refine classical treatments of the dipole-exchange spectrum, improving accuracy for realistic film geometries and informing the design of magnonic waveguides, filters and logic elements. Spin wave dynamics in ferromagnetic films underpin emerging low-power signal processing schemes in magnonics and spintronics, offering routes to RF components, interconnects and sensors compatible with on-chip integration. Ongoing research targets the minimisation of damping, the control of nonreciprocity via engineered anisotropy or interfacial interactions, and the exploitation of hybrid structures for voltage- or current-driven magnonic switching.
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Spin Wave Dynamics in Ferromagnetic Films publication trend
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Technical terms
Spin wave: collective oscillation of electron spins in a magnetically ordered material, quantised as magnons.
Dipole–exchange interaction: the combined effect of long-range magnetic dipolar forces and short-range exchange coupling shaping spin-wave dispersion.
Damon–Eschbach mode: a surface spin-wave mode in thin films with in-plane magnetisation, exhibiting nonreciprocal propagation at opposite surfaces.
Brillouin light scattering (BLS): an optical spectroscopy technique that measures inelastic scattering of light by magnons to resolve spin-wave frequencies and wavevectors.
Ferromagnetic resonance (FMR): a microwave technique that detects uniform precession of magnetisation to determine dynamic magnetic properties such as linewidth and damping.
References
- Brillouin Light Scattering from Magnetic Excitations. Materials (2023).
- Low‐Damping Spin‐Wave Transmission in YIG/Pt‐Interfaced Structures. Advanced Materials Interfaces (2022).
- Theory of the dipole-exchange spin wave spectrum in ferromagnetic films with in-plane magnetization revisited. Journal of Magnetism and Magnetic Materials (2022).
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