Visualizing nanoscale spin waves using MAXYMUS

Gräfe, Joachim; Weigand, Markus; Waeyenberge, Bartel Van; Gangwar, Ajay; Groß, Felix; Lisiecki, Filip; Rychły, Justyna; Stoll, Hermann; Träger, Nick; Förster, Jens; Stobiecki, F.; Dubowik, J.; Klos, Jaroslaw W.; Krawczyk, Maciej; Back, Christian; Goering, E.; Schütz, Gisela

doi:10.1117/12.2530326

Cited by 14 publications

(13 citation statements)

References 16 publications

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“…The proposed approach can be verified experimentally by the state of the art techniques, like an XMCD 53,54 , phase-resolved BLS 55 or broadband microwave spectroscopy 32,56 . We believe that our findings are substantial for further development of the circuits for analog and digital computing based on SWs and contribute to the field of magnonics.…”

Section: Discussionmentioning

confidence: 92%

An anomalous refraction of spin waves as a way to guide signals in curved magnonic multimode waveguides

Mieszczak,

Busel,

Gruszecki

et al. 2020

Preprint

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We present a method for efficient spin wave guiding within the magnonic nanostructures. Our technique is based on the anomalous refraction in the metamaterial flat slab. The gradual change of the material parameters (saturation magnetization or magnetic anisotropy) across the slab allows tilting the wavefronts of the transmitted spin waves and controlling the refraction. Numerical studies of the spin wave refraction are preceded by the analytical calculations of the phase shift acquired by the spin wave due to the change of material parameters in a confined area. We demonstrate that our findings can be used to guide the spin waves smoothly in curved waveguides, even through sharp bends, without reflection and scattering between different waveguide's modes, preserving the phase -the quantity essential for wave computing.

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Section: Discussionmentioning

confidence: 92%

An anomalous refraction of spin waves as a way to guide signals in curved magnonic multimode waveguides

Mieszczak,

Busel,

Gruszecki

et al. 2020

Preprint

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“…The STXM measurements were performed at the BESSY II synchrotron, using the MPI IS operated MAXYMUS end station at the UE46-PGM2 beam line. 48 The out-of-plane component of the magnetization was probed using circularly polarized light at normal incidence. The applied field, with a maximum value of 300 mT, was generated by a set of four rotatable permanent magnets 49 .…”

Section: Scanning Transmission X-ray Microscopymentioning

confidence: 99%

Freezing and thawing magnetic droplet solitons

Ahlberg,

Chung,

Jiang

et al. 2021

Preprint

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Magnetic droplets are non-topological magnetodynamical solitons displaying a wide range of complex dynamic phenomena with potential for microwave signal generation. Bubbles, on the other hand, are internally static cylindrical magnetic domains, stabilized by external fields and magnetostatic interactions. In its original theory, the droplet was described as an imminently collapsing bubble stabilized by spin transfer torque and, in its zero-frequency limit, as equivalent to a bubble. Without nanoscale lateral confinement, pinning, or an external applied field, such a nanobubble is unstable, and should collapse. Here, we show that

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“…While the existence of STCs has been shown in literature, lattice scattering processes have not yet been observed [17,18]. To this end, we generate a driven STC in a Py waveguide and directly image it by time-resolved STXM with x-ray circular dichroism (XMCD) contrast (20 nm spatial and 50 ps temporal resolution) [3,19,20]. We use this technique to show the formation of a driven STC and investigate its interaction with magnons at room temperature.…”

mentioning

confidence: 99%

Real space observation of magnon interaction with driven space-time crystals

Träger,

Gruszecki,

Lisiecki

et al. 2019

Preprint

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The concept of Space-Time Crystals (STC), i.e. translational symmetry breaking in time and space, was recently proposed and experimentally demonstrated for quantum systems. Here, we transfer this concept to magnons and experimentally demonstrate a driven STC at room temperature. The STC is realized by strong homogeneous micro-wave pumping of a micron-sized permalloy (Py) stripe and is directly imaged by Scanning Transmission X-ray Microscopy (STXM). For a fundamental understanding of the formation of the STC, micromagnetic simulations are carefully adapted to model the experimental findings. Beyond the mere generation of a STC, we observe the formation of a magnonic band structure due to back folding of modes at the STC's Brillouin zone boundaries. We show interactions of magnons with the STC that appear as lattice scattering. This results in the generation of ultra short spin waves down to 100 nm wavelength that cannot be described by classical dispersion relations for linear spin wave excitations. We expect that room temperature STCs will be a useful tool to investigate non-linear wave physics, as they can be easily generated and manipulated to control their spatial and temporal band structure.

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Visualizing nanoscale spin waves using MAXYMUS

Cited by 14 publications

References 16 publications

An anomalous refraction of spin waves as a way to guide signals in curved magnonic multimode waveguides

An anomalous refraction of spin waves as a way to guide signals in curved magnonic multimode waveguides

Freezing and thawing magnetic droplet solitons

Real space observation of magnon interaction with driven space-time crystals

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