Spontaneous Exact Spin-Wave Fractals in Magnonic Crystals

Richardson, Daniel; Kalinikos, B. A.; Carr, Lincoln D.; Wu, Mingzhong

doi:10.1103/physrevlett.121.107204

Cited by 23 publications

(22 citation statements)

References 20 publications

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“…In this work, Object-Oriented Micromagnetic Framework (OOMMF) simulations were performed on the filter structure shown in Figure 1a. OOMMF solves Landau-Lifshitz-Gilbert (LLG) equation using finite-difference methods [20][21][22][23].…”

Section: Methodsmentioning

confidence: 99%

Engineered Magnetization Dynamics of Magnonic Nanograting Filters

2021

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Magnonic crystals and gratings could enable tunable spin-wave filters, logic, and frequency multiplier devices. Using micromagnetic models, we investigate the effect of nanowire damping, excitation frequency and geometry on the spin wave modes, spatial and temporal transmission profiles for a finite patterned nanograting under external direct current (DC) and radio frequency (RF) magnetic fields. Studying the effect of Gilbert damping constant on the temporal and spectral responses shows that low-damping leads to longer mode propagation lengths due to low-loss and high-frequency excitations are also transmitted with high intensity. When the nanowire is excited with stronger external RF fields, higher frequency spin wave modes are transmitted with higher intensities. Changing the nanowire grating width, pitch and its number of periods helps shift the transmitted frequencies over super high-frequency (SHF) range, spans S, C, X, Ku, and K bands (3–30 GHz). Our design could enable spin-wave frequency multipliers, selective filtering, excitation, and suppression in magnetic nanowires.

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Section: Methodsmentioning

confidence: 99%

Engineered Magnetization Dynamics of Magnonic Nanograting Filters

2021

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“…Magnonic crystals are formed by periodically adjusting material parameters, see, e.g., Ciubotaru et al, (2013), Obry et al 2013, Banerjee et al (2017), and Richardson et al (2018) or external fields, see, e.g., Chumak et al (2009) and Ustinov et al (2019). As an artificial magnetic crystal, magnonic crystals are an important component of spin-wave devices.…”

Section: Magnonic Crystalsmentioning

confidence: 99%

“…This also enables spin-wave filtering and other functions. Figure 2A shows a magnonic crystal with a groove array, where the width and height of the groove determine the propagating characteristics of the passing spin waves (Richardson et al, 2018). Figure 2B shows the spin-wave propagation characteristics (left side) and dispersion relationship (right side) of magnonic crystal in Figure 2A.…”

Section: Magnonic Crystalsmentioning

confidence: 99%

“…Previous studies have shown that ion migration in materials changes the thermal conductivity (Padture et al, 2002), optical properties (Lu et al, 2017), electrical conductivity (Waser et al, FIGURE 2 | (A) A static magnonic crystal with a groove array, where the width and height of the groove determine the propagation characteristics of the passing spin waves (Richardson et al, 2018). Reproduced with the permission from https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.121.107204.…”

Section: Magneto-inonic Transportmentioning

confidence: 99%

“…(B) The spin-wave propagation characteristics (left side) and the dispersion relationship (right side) of magnonic crystal in (A). It is clearly seen that spin waves are forbidden to a certain extent at specific frequencies (4.18, 4.23 and 4.3 GHz) known as "band gaps" while they can propagate freely in other frequencies (Richardson et al, 2018). Reproduced with the permission from https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.121.107204.…”

Section: Magneto-inonic Transportmentioning

confidence: 99%

See 2 more Smart Citations

Quantum Spin-Wave Materials, Interface Effects and Functional Devices for Information Applications

Jin

Liao

et al. 2020

Front. Mater.

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With the continuous miniaturization of electronic devices and the increasing speed of their operation, solving a series of technical issues caused by high power consumption has reached an unprecedented level of difficulty. Fortunately, magnons (the quanta of spin waves), which are the collective precession of spins in quantum magnetic materials, making it possible to replace the role of electrons in modern information applications. In the process of information transmission, nano-sized spin-wave devices do not transport any physical particles; therefore, the corresponding power consumption is extremely low. This review focuses on the emerging developments of the spin-wave materials, tunable effects, and functional devices applications. In the materials front, we summarize the magnetic properties and preparation characteristics of typical insulating single-crystalline garnet films or metallic alloy films, the development of new spin-wave material system is also introduced. Afterward, we introduce the emerging electric control of spin-wave effects originating from the interface transitions, physical or chemical, among these films including, voltage-controlled magnetic anisotropy, magneto-ionic transport, electric spin-torque, and magnon-torque. In the functional devices front, we summarize and elaborate on the low dispassion information processing devices and sensors that are realized based on spin waves.

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Skyrmion‐Excited Spin‐Wave Fractal Networks

et al. 2023

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Magnetic skyrmions exhibit unique, technologically relevant pseudo‐particle behaviors which arise from their topological protection, including well‐defined, 3D dynamic modes that occur at microwave frequencies. During dynamic excitation, spin waves are ejected into the interstitial regions between skyrmions, creating the magnetic equivalent of a turbulent sea. However, since the spin waves in these systems have a well‐defined length scale, and the skyrmions are on an ordered lattice, ordered structures from spin‐wave interference can precipitate from the chaos. This work uses small‐angle neutron scattering (SANS) to capture the dynamics in hybrid skyrmions and investigate the spin‐wave structure. Performing simultaneous ferromagnetic resonance and SANS, the diffraction pattern shows a large increase in low‐angle scattering intensity, which is present only in the resonance condition. This scattering pattern is best fit using a mass fractal model, which suggests the spin waves form a long‐range fractal network. The fractal structure is constructed of fundamental units with a size that encodes the spin‐wave emissions and are constrained by the skyrmion lattice. These results offer critical insights into the nanoscale dynamics of skyrmions, identify a new dynamic spin‐wave fractal structure, and demonstrate SANS as a unique tool to probe high‐speed dynamics.

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Spontaneous Exact Spin-Wave Fractals in Magnonic Crystals

Cited by 23 publications

References 20 publications

Engineered Magnetization Dynamics of Magnonic Nanograting Filters

Engineered Magnetization Dynamics of Magnonic Nanograting Filters

Quantum Spin-Wave Materials, Interface Effects and Functional Devices for Information Applications

Skyrmion‐Excited Spin‐Wave Fractal Networks

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