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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/231420
Micromagnetic study of spin-wave dispersion engineering and magnon confinement in YIG magnonic crystals
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This work investigates magnonic crystals based on nanostructured Yttrium Iron Garnet (YIG) waveguides through micromagnetic simulations performed with mumax3. Two main objectives are addressed: engineering controllable spin-wave band structures and spatially confining magnons in a cavity. The structures consist of a YIG waveguide patterned with a one-dimensional periodic array of holes of varying geometry. For rectangular holes, a lower flat band emerges whose frequency decreases with increasing hole width, providing a geometric tuning knob; this tunability is exploited to design a magnon cavity that confines magnons at a defect site via a quadratic taper.
Concave and elliptical geometries yield quasi-gapless, thin-film-like dispersions, identified as the most suitable candidates for magnon Rayleigh–Jeans condensation, which preliminary parametric-pumping simulations did not yet achieve.
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Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2026, Tutor: Marius V. Costache
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HOMAR GENOVART, Antoni. Micromagnetic study of spin-wave dispersion engineering and magnon confinement in YIG magnonic crystals. [consulted: 12 of September of 2026]. Available at: https://hdl.handle.net/2445/231420