Establishing the magnetoelastic origin of spin-wave routing through focused-ion-beam patterning

Naunheimer Felix; Greil Johannes; Ahrens Valentin; Maucha Levente; Papp Ádám; Csaba György; Becherer Markus: Establishing the magnetoelastic origin of spin-wave routing through focused-ion-beam patterning.
PHYSICAL REVIEW APPLIED, 26 (2). ISSN 2331-7019 (2026)

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Folyóiratcikk

Szerző azonosítók:

Név	ORCID	MTMT szerző azonosító
Naunheimer Felix	0009-0005-4024-0492
Greil Johannes	0009-0009-5693-7736
Ahrens Valentin	0000-0003-0226-2672
Maucha Levente		10094092
Papp Ádám		10045902
Csaba György		10057150
Becherer Markus	0000-0002-1291-8877

Absztrakt (kivonat):

Spin waves are promising information carriers for analog and wave-based computing, where functionality relies on compact and precisely engineered scattering landscapes. Focused-ion-beam (FIB) irradiation enables such control by locally tailoring the spin-wave dispersion in yttrium iron garnet. However, a nonmonotonic dependence of the spin-wave wavelength on increasing ion dose hinders predictive landscape design. Here, we present an experimentally validated framework that explains this nonmonotonic spin-wave steering by linking phenomenological strain-induced anisotropy to its magnetoelastic origin. Irradiation-induced lattice dislocations drive elastic and plastic deformation, which evolve into partial amorphization, each stage contributing distinctly to the dispersion behavior. We combine postirradiation wet-chemical etching and atomic force microscopy to quantify thickness changes and track the dispersion in etched regions using time-resolved magneto-optical Kerr effect microscopy. Fitting the data to the Kalinikos–Slavin formalism with an added effective magnetoelastic field isolates contributions from elastic and plastic deformation. Validation is achieved by mapping the deformation evolution onto a three-phase scenario based on SRIM simulations, reproducing the extracted field trends, and consistent strain-tensor and micromagnetic analyses. These results establish a physical basis for FIB-engineered graded-index spin-wave landscapes and magnetoelastically programmable magnonic devices.

Folyóirat címe:

PHYSICAL REVIEW APPLIED

Megjelenés éve:

2026

Kötet:

Szám:

ISSN:

2331-7019

Intézmény:

Pázmány Péter Katolikus Egyetem

Kar:

Információs Technológiai és Bionikai Kar (2013.07.-)