Spin‐Wave Optics in YIG Realized by Ion‐Beam Irradiation

Kiechle, Martina; Papp, Á.; Mendisch, Simon; Ahrens, Valentin; Golibrzuch, Matthias; Bernstein, Gary H.; Porod, Wolfgang; Csaba, G.; Becherer, Markus

doi:10.1002/smll.202207293

Cited by 17 publications

(2 citation statements)

References 36 publications

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“…via ion-irradiation, so as to introduce a sort of grey-scale magnonics. [26] However, we stress here that in our case we don't need any physical fabrication step of pre-patterning as the local crystallization intrinsically defines the geometry of the magnonic structure embedded in a non-magnetic amorphous film.…”

Section: Introductionmentioning

confidence: 97%

Patterning Magnonic Structures via Laser Induced Crystallization of Yittrium Iron Garnet

Giacco,

Maspero,

Levati

et al. 2024

Adv Funct Materials

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The fabrication and integration of high‐quality structures of Yttrium Iron Garnet (YIG) is critical for magnonics. Films with excellent properties are obtained only on single crystal Gadolinium Gallium Garnet (GGG) substrates using high‐temperature processes. The subsequent realization of magnonic structures via lithography and etching is not straightforward as it requires a tight control of the edge roughness, to avoid magnon scattering, and planarization in case of multilayer devices. In this work a different approach is described based on local laser annealing of amorphous YIG films, avoiding the need for subjecting the entire sample to high thermal budgets and for physical etching. Starting from amorphous and paramagnetic YIG films grown by pulsed laser deposition at room temperature on GGG, a 405 nm laser is used for patterning arbitrary shaped ferrimagnetic structures by local crystallization. In thick films (160 nm) the laser induced surface corrugation prevents the propagation of spin‐wave modes in patterned conduits. For thinner films (80 nm) coherent propagation is observed in 1.2 µm wide conduits displaying an attenuation length of 5 µm that is compatible with a damping coefficient of ≈5 × 10−3. Possible routes to achieve damping coefficients compatible with state‐of‐the art epitaxial YIG films are discussed.

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Section: Introductionmentioning

confidence: 97%

Patterning Magnonic Structures via Laser Induced Crystallization of Yittrium Iron Garnet

Giacco,

Maspero,

Levati

et al. 2024

Adv Funct Materials

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“…Shape anisotropy is deliberately tuned by the geometric variation of the structure’s footprint, and in the third dimension, i.e., thickness modulation. This can be used for the development of spin–wave optic devices [ 44 , 45 , 46 ] and the manipulation of spin–wave beams. In this regard, magnetic FEBID deposits have already demonstrated functional properties: structural engineering by FIB milled small holes in Co FEBID nanodots stabilised metastable intermediate states during magnetisation reversal; applicable to development of multilevel memories [ 47 ].…”

Section: Introductionmentioning

confidence: 99%

3D Magnonic Conduits by Direct Write Nanofabrication

et al. 2023

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Magnonics is a rapidly developing domain of nanomagnetism, with application potential in information processing systems. Realisation of this potential and miniaturisation of magnonic circuits requires their extension into the third dimension. However, so far, magnonic conduits are largely limited to thin films and 2D structures. Here, we introduce 3D magnonic nanoconduits fabricated by the direct write technique of focused-electron-beam induced deposition (FEBID). We use Brillouin light scattering (BLS) spectroscopy to demonstrate significant qualitative differences in spatially resolved spin-wave resonances of 2D and 3D nanostructures, which originates from the geometrically induced non-uniformity of the internal magnetic field. This work demonstrates the capability of FEBID as an additive manufacturing technique to produce magnetic 3D nanoarchitectures and presents the first report of BLS spectroscopy characterisation of FEBID conduits.

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Investigation of Mode‐Induced Spin Wave Transmission Blockage by In Situ Nanoscale Grooves

Delforge,

Lejeune,

Singh

et al. 2024

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In the pursuit of advancing spin‐wave optics, the propagation of magnetostatic surface spin‐waves is investigated in a uniform permalloy waveguide with in‐situ nanopatterned grooves created through Atomic Force Microscopy nanolithography and Focused Ion Beam etching. The study unveils that the introduction of narrow constrictions and grooves leads to a non‐monotonic reduction of the transmitted spin‐wave signal intensity as the spin‐wave pathway is shrinked. The remarkable feature that a stronger signal extinction is obtained for a narrow groove compared to a spin‐waveguide interrupted by a full gap, where only inefficient transport through dipolar coupling is allowed, is highlighted. Combining experimental and numerical analyses, the intricate interplay between spin‐wave diffraction and reflection at the waveguide edges is unraveled, being at the origin of a transverse‐mode variation responsible for the signal extinction when detected using coplanar antennas. The findings offer insights into the controllable manipulation of detected spin‐wave intensity, thereby opening promising avenues for the improvement of spin‐wave switches and interferometers, and for the nanopatterning of graded index magnonics.

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Spin‐Wave Optics in YIG Realized by Ion‐Beam Irradiation

Cited by 17 publications

References 36 publications

Patterning Magnonic Structures via Laser Induced Crystallization of Yittrium Iron Garnet

Patterning Magnonic Structures via Laser Induced Crystallization of Yittrium Iron Garnet

3D Magnonic Conduits by Direct Write Nanofabrication

Investigation of Mode‐Induced Spin Wave Transmission Blockage by In Situ Nanoscale Grooves

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