Theory of spin and lattice wave dynamics excited by focused laser pulses

Shen, Ka; Bauer, G.

doi:10.1088/1361-6463/aabd68

Cited by 11 publications

(8 citation statements)

References 34 publications

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“…Brillouin light scattering spectroscopy experiments have previously shown that the thermalisation of an overpopulated magnon gas, in combination with magnon-phonon scattering, leads to the self-organisation of so-called magnetoelastic bosons at the crossing point of the magnon and phonon dispersions 15 . This accumulation phenomenon is confirmed by micromagnetic simulations taking into account the magnetoelastic interaction of magnon-polaron dynamics 16 . Calculations of spin pumping by a parametric excitation also prove that magnons are resonantly enhanced in strength at the magnetoelastic crossing point 30 .…”

Section: Resultssupporting

confidence: 52%

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Dynamic self-organisation and pattern formation by magnon-polarons

et al. 2023

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Magnetic materials play a vital role in energy-efficient data storage technologies, combining very fast switching with long-term retention of information. However, it has been shown that, at very short time scales, magnetisation dynamics become chaotic due to internal instabilities, resulting in incoherent spin-wave excitations that ultimately destroy magnetic ordering. Here, contrary to expectations, we show that such chaos gives rise to a periodic pattern of reversed magnetic domains, with a feature size far smaller than the spatial extent of the excitation. We explain this pattern as a result of phase-synchronisation of magnon-polaron quasiparticles, driven by strong coupling of magnetic and elastic modes. Our results reveal not only the peculiar formation and evolution of magnon-polarons at short time-scales, but also present an alternative mechanism of magnetisation reversal driven by coherent packets of short-wavelength magnetoelastic waves.

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Section: Resultssupporting

confidence: 52%

“…It is well understood that a spatially-localised perturbation creates propagating waves with wave vectors determined by the profile of the excitation 16 , 22 . The results shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Dynamic self-organisation and pattern formation by magnon-polarons

et al. 2023

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“…This accumulation phenomenon is confirmed by micromagnetic simulations, taking into account the magnetoelastic interaction of magnonpolaron dynamics in Ref. [16]. Calculations of spin pumping by a parametric excitation also prove that magnons are resonantly enhanced in strength at the magnetoelastic crossing point [30].…”

supporting

confidence: 54%

“…The large-amplitude precessional motion leads to strong instability of the spin system and generates a sizeable number of spin waves, strongly populating the low-energy part of the magnon spectrum. The subsequent repopulation in the presence of a magneto-elastic interaction leads to effective 'condensation' of the waves into the magnon-polaron part of the spectrum, observed both experimentally and in micromagnetic simulations [15,16]. Ultimately, these magnon-polaron waves synchronize and achieve such high amplitude that they induce complete switching of magnetisation at the wave maxima.…”

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confidence: 96%

Dynamic self-organisation and pattern formation by magnon-polarons

Gidding¹,

Janssen²,

S.³

et al. 2022

Preprint

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Nonlinear dynamics can give rise, via the processes of self-organisation and pattern formation, to the spontaneous manifestation of order in open and complex systems far from equilibrium. Self-organising systems, transforming the inflow of energy into information, are ubiquitously found in current topical areas of science ranging from brainwave entrainment and neuromorphic computing to energy-efficient data storage technologies. In the latter, magnetic materials play a pivotal role combining very fast switching with permanent retention of information. However, it has been shown that, at very short time scales, magnetisation dynamics become chaotic due to internal instabilities, resulting in incoherent spin-wave excitations that ultimately destroy magnetic ordering. Here, contrary to all expectations, we show that such chaos gives rise to a periodic pattern of reversed magnetic domains, with a feature size far smaller than the spatial extent of the excitation. We explain this pattern as a result of phase-synchronisation of magnon-polaron waves, driven by strong coupling of magnetic and elastic modes. Our results reveal not only the peculiar formation and evolution of magnon-polarons at short time-scales, but also present a novel mechanism of magnetization reversal driven by coherent packets of short-wavelength quasiparticles.Finding methods that enable fast, efficient and long-lasting reversal of magnetisation direction represents a major topic of research in condensed matter physics with obvious technological applications [1]. The most theoreticallystraightforward but also practical approach for switching magnetisation 1

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“…( 3). extension of Damon-Eshbach theory into AFM also gives the spatial profiles of the mode-dependent magnetization dynamics [37,38]. In Fig.…”

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confidence: 99%

Dipolar spin waves in uniaxial easy-axis antiferromagnets: A natural topological nodal-line semimetal

Liu,

Wang,

Shen

2020

Preprint

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Theory of spin and lattice wave dynamics excited by focused laser pulses

Cited by 11 publications

References 34 publications

Dynamic self-organisation and pattern formation by magnon-polarons

Dynamic self-organisation and pattern formation by magnon-polarons

Dynamic self-organisation and pattern formation by magnon-polarons

Dipolar spin waves in uniaxial easy-axis antiferromagnets: A natural topological nodal-line semimetal

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