Vortex circulation patterns in planar microdisk arrays

Velten, Sven; Streubel, Robert; Farhan, Alan; Kent, Noah; Im, Mi‐Young; Schöll, A.; Dhuey, Scott; Behncke, Carolin; Meier, Guido; Fischer, Peter

doi:10.1063/1.4990990

Cited by 22 publications

(17 citation statements)

References 25 publications

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“…2(a) with symbols and curves representing simulation results and analytical formulas, respectively. In the calculations, we have adopted the material parameters of Permalloy (Py: Ni 80 Fe 20 ) [61,62] with G = 3.0725 × 10 −13 Js/m 2 . The spring constant K, mass M, and non-Newtonian gyration G 3 are obtained by analyzing the dynamics of a single vortex confined in the nanodisk [54,63]: K = 1.8128 × 10 −3 J/m 2 , M = 9.1224 × 10 −25 kg, and G 3 = 4.5571 × 10 −35 Js 3 /m 2 (see Supplementary Note 1).…”

Section: Corner States and Phase Diagrammentioning

confidence: 99%

Higher-order topological solitonic insulators

Cao

Peng

et al. 2019

npj Comput Mater

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Pursuing topological phase and matter in a variety of systems is one central issue in current physical sciences and engineering. Motivated by the recent experimental observation of corner states in acoustic and photonic structures, we theoretically study the dipolar-coupled gyration motion of magnetic solitons on the twodimensional breathing kagome lattice. We calculate the phase diagram and predict both the Tamm-Shockley edge modes and the second-order corner states when the ratio between alternate lattice constants is greater than a critical value. We show that the emerging corner states are topologically robust against both structure defects and moderate disorders. Micromagnetic simulations are implemented to verify the theoretical predictions with an excellent agreement. Our results pave the way for investigating higher-order topological insulators based on magnetic solitons. arXiv:1909.11511v1 [cond-mat.mes-hall]

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Section: Corner States and Phase Diagrammentioning

confidence: 99%

Higher-order topological solitonic insulators

Cao

Peng

et al. 2019

npj Comput Mater

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“…This means that any arbitrary design can be realized, including more exotic arrays, not only based on extensions of the square and kagome geometries 7,[14][15][16] but also going beyond periodic systems to artificial quasicrystals 17,18 . In addition to systems with separated elongated nanomagnets, there are also noteworthy systems with circular [19][20][21][22][23] or square magnets 24 , or connected systems in which domain walls can travel through the network. The first efforts to create and characterize 3D artificial spin systems are also underway.…”

mentioning

confidence: 99%

Advances in artificial spin ice

et al. 2019

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Artificial spin ices consist of nanomagnets arranged on the sites of various periodic and aperiodic lattices. They have enabled the experimental investigation of a variety of fascinating phenomena such as frustration, emergent magnetic monopoles and phase transitions that have previously been the domain of bulk spin crystals and theory , as we discuss in this Review. Artificial spin ices also show promise as reprogrammable magnonic crystals and, with this in mind, we give an overview of the measurements of fast dynamics in these magnetic metamaterials. We survey the variety of geometries that have been implemented, in terms of both the form of the nanomagnets and the lattices on which they are placed, including quasicrystalline systems and artificial spin systems in 3D. Different magnetic materials can also be incorporated to modify anisotropies and blocking temperatures, for example. With this large variety of systems, the way is open to discover new phenomena, and we complete this Review with possible directions for the future.

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“…Our system provides an excellent controllability of spin-wave properties. Tuning of the circularity configurations 22,23 can be used to manipulate the propagation direction of the spin waves as most prominently seen in Fig. 4b, d as well as in the corresponding Supplementary Movie 3b, d. Tuning of the polarisation configuration [24][25][26][27] can be used to manipulate the wavelength and shape of the spin waves.…”

Section: Micromagnetic Simulations Of Magnetisation Configurationsmentioning

confidence: 95%

Spin-wave interference in magnetic vortex stacks

et al. 2018

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Spin waves with wavelengths in the nanometre range could serve as data carriers in future magnonic logic or signal processing devices. We investigate the interference of spin waves emitted from magnetic vortices in two exchange-coupled vortex stacks. The spin-wave dynamics are studied using scanning transmission X-ray microscopy and micromagnetic simulations. Stacks of vortices provide an excellent controllability of spin-wave properties including a tunable wavelength in the 100 nm regime and manipulation of their propagation direction via the magnetisation configuration. Furthermore, interference gives rise to amplified or reduced spin-wave amplitudes in distinct areas of the structure providing controlled confinement crucial for future applications of spin waves.

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Vortex circulation patterns in planar microdisk arrays

Cited by 22 publications

References 25 publications

Higher-order topological solitonic insulators

Higher-order topological solitonic insulators

Advances in artificial spin ice

Spin-wave interference in magnetic vortex stacks

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