Optically Inspired Nanomagnonics with Nonreciprocal Spin Waves in Synthetic Antiferromagnets

Albisetti, Edoardo; Tacchi, S.; Silvani, Raffaele; Scaramuzzi, Giuseppe; Finizio, Simone; Wintz, Sebastian; Rinaldi, Christian; Cantoni, Matteo; Raabe, Jörg; Carlotti, G.; Bertacco, Riccardo; Riedo, Elisa; Petti, Daniela

doi:10.1002/adma.201906439

Cited by 66 publications

(66 citation statements)

References 68 publications

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“…A clear transmission gap is only visible for positive fields. The observed nonreciprocity is not related to the spin-wave excitation process [20][21][22][23] , but rather a frequency-specific feature of spin-wave transport across the YIG/CoFeB bilayer. The number of transmission gaps and the gap frequency depend on the stripe width (Fig.…”

Section: Resultsmentioning

confidence: 82%

Nanoscale magnonic Fabry-Pérot resonator for low-loss spin-wave manipulation

et al. 2021

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Active control of propagating spin waves on the nanoscale is essential for beyond-CMOS magnonic computing. Here, we experimentally demonstrate reconfigurable spin-wave transport in a hybrid YIG-based material structure that operates as a Fabry-Pérot nanoresonator. The magnonic resonator is formed by a local frequency downshift of the spin-wave dispersion relation in a continuous YIG film caused by dynamic dipolar coupling to a ferromagnetic metal nanostripe. Drastic downscaling of the spin-wave wavelength within the bilayer region enables programmable control of propagating spin waves on a length scale that is only a fraction of their wavelength. Depending on the stripe width, the device structure offers full nonreciprocity, tunable spin-wave filtering, and nearly zero transmission loss at allowed frequencies. Our results provide a practical route for the implementation of low-loss YIG-based magnonic devices with controllable transport properties.

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Section: Resultsmentioning

confidence: 82%

Nanoscale magnonic Fabry-Pérot resonator for low-loss spin-wave manipulation

et al. 2021

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“…Spin waves in various materials have shown potential for realization in applications such as wave‐based computing and utilization in magnon–magnon interaction‐based nonlinear effects. [ 1–4 ] Materials with low magnetic damping and compatibility with micro‐sized patterning are of particular interest. As spin waves can be generated by methods such as spin‐transfer torque, [ 5,6 ] the possibility of combining these techniques with 2D magnetic materials [ 7–9 ] can open up access to devices with multi‐functional properties.…”

Section: Figurementioning

confidence: 99%

Observation of Standing Spin Waves in a van der Waals Magnetic Material

et al. 2020

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Spin waves are studied for data storage, communication, and logic circuits in the field of spintronics based on their potential to substitute electrons. The recent discovery of magnetism in 2D systems such as monolayer CrI3 and Cr2Ge2Te6 has led to a renewed interest in such applications of magnetism in the 2D limit. Here, direct evidence of standing spin waves is presented along with the uniform precessional resonance modes in the van der Waals magnetic material, CrCl3. This is the first direct observation of standing spin‐wave modes, set up along a thickness of 20 mm, in a van der Waals material. Standing spin waves are detected in the vicinity of both branches, optical and acoustic, of the antiferromagnetic resonance. Magnon–magnon coupling and softening of resonance modes with temperature enable extraction of interlayer exchange field as a function of temperature.

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“…[ 11,12,55 ] In addition to creating skyrmions in the perpendicularly magnetized thin films, this technique may also have an impact on the study of magnonics. In fact, this technique could be used to engineer magnetic domain patterns for exploiting the active manipulation of spin waves, [ 56–58 ] analogous to the pioneering work on patterning specific in‐plane magnetic domain structures via advanced scanning‐probe‐based technique. [ 56,59 ] Moreover, the reported technique provides the possibility of manipulating local antiferromagnetic domain, which will promote the study on antiferromagnetic skyrmion and perhaps the development of related devices.…”

Section: Figurementioning

confidence: 99%

Electron Beam Lithography of Magnetic Skyrmions

et al. 2020

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The recently discovered topological magnetic skyrmion spin texture promises future innovative memory and logic devices owing to its nanoscale size and low driving current density. [1-4] Concerning their nontrivial real-space topology, skyrmions exhibit many intriguing properties, [5-8] such as the topological Hall effect, [6] the skyrmion Hall effect, [9] and the rich ferromagnetic resonance states. [10] Furthermore, long-range ordered and disordered skyrmion lattices also give rise to fascinating phenomena like a chiral magnon state [11,12] and skyrmion glass state, [13] thus providing an arena for exploring topological physics, [14,15] nonreciprocal responses, [16] and unconventional spintronic devices. [17,18] To further elucidate the physics of skyrmions and their lattices, the crucial task is to create skyrmions in a controllable manner. The emergence of magnetic skyrmions, topological spin textures, has aroused tremendous interest in studying the rich physics related to their topology. While skyrmions promise high-density and energy-efficient magnetic memory devices for information technology, the manifestation of their nontrivial topology through single skyrmions and ordered and disordered skyrmion lattices could also give rise to many fascinating physical phenomena, such as chiral magnon and skyrmion glass states. Therefore, generating skyrmions at designated locations on a large scale, while controlling the skyrmion patterns, is the key to advancing topological magnetism. Here, a new, yet general, approach to the "printing" of skyrmions with zero-field stability in arbitrary patterns on a massive scale in exchange-biased magnetic multilayers is presented. By exploiting the fact that the antiferromagnetic order can be reconfigured by local thermal excitations, a focused electron beam with a graphic pattern generator to "print" skyrmions is used, which is referred to as skyrmion lithography. This work provides a route to design arbitrary skyrmion patterns, thereby establishing the foundation for further exploration of topological magnetism.

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Optically Inspired Nanomagnonics with Nonreciprocal Spin Waves in Synthetic Antiferromagnets

Cited by 66 publications

References 68 publications

Nanoscale magnonic Fabry-Pérot resonator for low-loss spin-wave manipulation

Nanoscale magnonic Fabry-Pérot resonator for low-loss spin-wave manipulation

Observation of Standing Spin Waves in a van der Waals Magnetic Material

Electron Beam Lithography of Magnetic Skyrmions

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