A scenario for magnonic spin-wave traps

Busse, Frederik; Mansurova, M.; Lenk, Benjamin; Ehe, Marvin von der; Münzenberg, Markus

doi:10.1038/srep12824

Cited by 21 publications

(19 citation statements)

References 21 publications

(39 reference statements)

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“…In the case, when the field is applied at 90 ∘ with respect to the lattice, the DE modes are generated at both ends of the notch and propagating towards each other, traveling a distance of 10µm till they meet. This distance coincides with the calculation made in [18], when assuming a higher group velocity outside of the magnonic crystal of gr = 25 km s , the DE mode generated in the crystal is able to propagate distances in the order of 10µm to the middle of the notch. With this propagation distance out of the magnonic crystal for this kind of spin waves, the size of 20µm chosen for the notch width has the optimal size for forwarding the DE modes out of the crystal.…”

Section: Resultssupporting

confidence: 88%

Magnetization dynamics in magnonic structures with different geometries: interfaces, notches and waveguides

Mansurova

Haar

Panke

et al. 2017

J. Phys.: Condens. Matter

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The discovery of ultrafast magnetization dynamics 20 years ago has led to a broad variety of experimental techniques to explore phenomena in magnetic materials with high temporal resolution. In the current article we present a study dealing with broadband excitation of spin-wave packets at different magnonic crystal continuous magnetic film interfaces. Similar to protected conducting states on the surfaces of topological band insulators, these interfaces exhibit surface spin-wave modes that propagate out of the crystal into the continuous film. The propagation distance depends on the direction of the applied magnetic field as well as the surface geometry of the crystal.

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Section: Resultssupporting

confidence: 88%

Magnetization dynamics in magnonic structures with different geometries: interfaces, notches and waveguides

Mansurova

Haar

Panke

et al. 2017

J. Phys.: Condens. Matter

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“…Several methods have been explored in recent years. Among them are spin-wave injection from spin-torque nano-oscillators [4][5][6][7] and all-optical excitation using focused laser beams [8][9][10]. The wavelength of emitted spin waves from these pointlike sources is roughly twice the nano-oscillator or laser spot size.…”

Section: Introductionmentioning

confidence: 99%

Tunable Short-Wavelength Spin-Wave Emission and Confinement in Anisotropy-Modulated Multiferroic Heterostructures

Hämäläinen¹,

Brandl

Franke³

et al. 2017

Phys. Rev. Applied

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We report on the generation and confinement of short-wavelength spin waves in a continuous film with periodically modulated magnetic anisotropy. The concept, which is demonstrated for strain-coupled Co 40 Fe 40 B 20 =BaTiO 3 heterostructures, relies on abrupt rotation of magnetic anisotropy at the boundaries of magnetic stripe domains. In combination with an external bias field, this modulation of magnetic anisotropy produces a lateral variation of the effective magnetic field, leading to local spin-wave excitation when irradiated by a microwave magnetic field. In domains with small effective field, spin waves are perfectly confined by the spin gap in neighboring domains. In contrast, standing spin waves in domains with large effective field radiate into neighboring domains. Using micromagnetic simulation, we show that the wavelength of emitted spin waves is tunable from a few micrometers down to about 100 nm by rotation of the bias field. Importantly, the orientation of the wave front remains fixed. We also demonstrate that dynamic fluctuations of the effective magnetic field produce exchange-dominated spin waves at singleanisotropy boundaries. The multiferroic heterostructures presented here enable the use of global excitation fields from a microwave antenna to emit tunable spin waves from a nanometer-wide line source at welldefined locations of a continuous ferromagnetic film.

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“…3) with branches coloured according to the contribution of exchange (yellow) and dipolar (blue) term to the spin wave energy [calculations are based on Eqs. (14)(15)]. We can see that after application of the external magnetic field all dispersion branches at low frequencies and long wavelengths became dipolar-dominated, which is manifested in their negative slope and in the change of the colour toward the blue.…”

Section: Resultsmentioning

confidence: 94%

“…The latter factor can be designed in the fabrication process. The magnetic configuration can be further controlled by the application of the external bias (magnetic field, temperature gradient, electric field or strain in multiferroic systems) [13,14,15]. This allows using magnetic nanostructures (arrays of wires or dots) of a specific structure for high-density information storage, where the spatial size of information bit is determined by the size of the nanoelement [16,17].…”

Section: Introductionmentioning

confidence: 99%

Spin Wave Modes in a Cylindrical Nanowire in Crossover of Dipolar-Exchange Regime

Rychły

Ткаченко

Kłos

et al. 2019

The 37th International Symposium on Dynamical Properties of Solids

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Nanoscale magnetic systems have been studied extensively in various geometries, such as wires of different cross-sections, arrays of wires, dots, rings, etc. Such systems have interesting physical properties and promising applications in advanced magnetic devices. Uniform magnetic nanowires are the basic structures which were broadly investigated. However, some of their dynamical properties, like: (anti)crossing between the spin wave modes and impact of the magnetic field on spin wave spectrum, still need to be exploited. We continue this research by investigation of the spin wave dynamics in solid Ni nanowire of the circular crosssection. We use two approaches: semi-analytical calculations and numerical computations based on finite element method. We solve coupled Landau-Lifshitz and Maxwell equations and consider both magnetostatic and exchange interactions. We identify the dispersion brunches and its (anti)crossing by plotting the spatial profiles of spin wave amplitudes and magnetostatic potential. We also check how we can tune the spectrum of the modes by application of the external magnetic field and how it affects the modes and their dominating type of interaction.

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A scenario for magnonic spin-wave traps

Cited by 21 publications

References 21 publications

Magnetization dynamics in magnonic structures with different geometries: interfaces, notches and waveguides

Magnetization dynamics in magnonic structures with different geometries: interfaces, notches and waveguides

Tunable Short-Wavelength Spin-Wave Emission and Confinement in Anisotropy-Modulated Multiferroic Heterostructures

Spin Wave Modes in a Cylindrical Nanowire in Crossover of Dipolar-Exchange Regime

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