Tunable geometrical frustration in magnonic vortex crystals

Behncke, Carolin; Adolff, Christian F.; Wintz, Sebastian; Hänze, Max; Schulte, B.; Weigand, Markus; Finizio, Simone; Raabe, Jörg; Meier, Guido

doi:10.1038/s41598-017-17480-1

Cited by 15 publications

(15 citation statements)

References 33 publications

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“…Investigations of spin-wave resonances in frustrated, artificial spin systems are not restricted to Ising-like systems. For example, coupled magnetic vortices arranged in a kagome geometry 116 display collective oscillation modes of the interacting vortex cores that are sensitive to an applied magnetic field. This system is particularly interesting because frustration leads to multiple vortex configurations, reflected by the resonant frequencies.…”

Section: Fast Dynamicsmentioning

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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Section: Fast Dynamicsmentioning

confidence: 99%

Advances in artificial spin ice

et al. 2019

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“…In the second regime, ranging from 20 to 120 Oe, we observe a distinct gap in the mode spectrum independent of the in-plane field angle. Typically, one can observe a decrease of the resonant frequency in this field range, followed by the nucleation of magnetic vortices in the disks accompanied by the onset of a gyrotropic motion of the vortices 33 . The gyrotropic motion typically occurs at frequencies well below 1 GHz (depending on the dimensions of the disks and specific material parameters).…”

Section: Resultsmentioning

confidence: 99%

“…There are two reasons for this, both of which arise from the smaller thickness and lateral dimensions of our sample compared to the honeycomb disks studied in Ref. [33]. First, since vortex dynamics generally produce a weak signal, less thickness can make the signal detection more challenging.…”

Section: Resultsmentioning

confidence: 99%

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Control of spin dynamics in artificial honeycomb spin-ice-based nanodisks

Kaffash,

Bang,

Lendinez

et al. 2020

Preprint

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We report the experimental and theoretical characterization of the angular-dependent spin dynamics in arrays of ferromagnetic nanodisks arranged on a honeycomb lattice. The magnetic field and microwave frequency dependence, measured by broadband ferromagnetic resonance, reveal a rich spectrum of modes that is strongly affected by the microstate of the network. Based on symmetry arguments with respect to the external field, we show that certain parts of the ferromagnetic network contribute to the detected signal. A comparison of the experimental data with micromagnetic simulations reveals that different subsections of the lattice predominantly contribute to the high-frequency response of the array. This is confirmed by optical characterizations using microfocused Brillouin light scattering. Furthermore, we find indications that nucleation and annihilation of vortex-like magnetization configurations in the low-field range affect the dynamics, which is different from clusters of ferromagnetic nanoellipses. Our work opens up new perspectives for designing magnonic devices that combine geometric frustration in gyrotropic vortex crystals at low frequencies with magnonic crystals at high frequencies.

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“…Recently, it was shown that the dynamics in an array of magnetic disks can be used for spin-pumping applications 25 . Furthermore, it was shown that a spinice network made of interacting magnetic microdisks has a controllable ground state, depending on the excitation frequency 26 .…”

Section: Introductionmentioning

confidence: 99%

Temperature-Dependent Anisotropic Magnetoresistance and Spin-Torque-Driven Vortex Dynamics in a Single Microdisk

Lendinez,

Polakovic,

Ding

et al. 2020

Preprint

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Spin-orbit-torque-driven dynamics have recently gained interest in the field of magnetism due to the reduced requirement of current densities and an increase in efficiency, as well as the ease of implementation of different devices and materials. From a practical point of view, the low-frequency dynamics below 1 GHz is particularly interesting since dynamics associated with magnetic domains lie in this frequency range. While spin-torque excitation of high-frequency modes has been extensively studied, the intermediate low-frequency dynamics have received less attention, although spin torques could potentially be used for both manipulation of the spin texture, as well as the excitation of dynamics. In this work, we demonstrate that it is possible to drive magnetic vortex dynamics in a single microdisk by spin-Hall torque at varying temperatures, and relate the results to transport properties. We find that the gyrotropic mode of the core couples to the low-frequency microwave signal and produces a measurable voltage. The dynamic measurements are in agreement with magnetic transport measurements and are supported by micromagnetic simulations. Our results open the door for integrating magnetic vortex devices in spintronic applications.

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Tunable geometrical frustration in magnonic vortex crystals

Cited by 15 publications

References 33 publications

Advances in artificial spin ice

Advances in artificial spin ice

Control of spin dynamics in artificial honeycomb spin-ice-based nanodisks

Temperature-Dependent Anisotropic Magnetoresistance and Spin-Torque-Driven Vortex Dynamics in a Single Microdisk

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