Influence of the demagnetizing field on the spin-wave softening in bicomponent magnonic crystals
TL;DR: In this article, the effect of the demagnetizing field on the spin-wave spectrum was studied in planar bi-component magnonic crystals (MCs) consisting of cobalt inclusions in permalloy matrix, as well as Py and Co matrix.
About: This article is published in Journal of Magnetism and Magnetic Materials.The article was published on 2021-11-11 and is currently open access. It has received 3 citations till now. The article focuses on the topics: Condensed matter physics & Spin wave.
Citations
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TL;DR: In this article , the spin dynamics at remanence (zero applied field) in a periodic square artificial spin ice (ASI) prepared four different microstates (i.e., with zero, two or four magnetic charges at the vertex).
Abstract: We present a micromagnetic investigation of the spin dynamics at remanence (zero applied field) in a periodic square artificial spin ice (ASI) prepared four different microstates (i.e., with zero, two or four magnetic charges at the vertex). The ASI elements consist of permalloy elliptical dots with a fixed long axis, and a variable width and interdot separation. For each vertex configuration, we compute the equilibrium ground state at zero applied field by relaxing a previously set magnetic configuration (microstate). After the excitation of such ground state, we perform a Fourier analysis obtaining frequency spectra and space phase profiles. We discuss the behavior of the spectra in changing the system’s microstate and geometry, with reference to the spin mode space profiles, magnetization configuration, and effective internal field. Our results draw a correlation between ASI macrospin orientation at vertex and a few important dynamic properties like a phase-shift in the mode profiles or the frequency gap between the edge and fundamental modes. We suggest a few specific experiments to validate of our predictions, as well as applications in the field of interferometric magnonic devices. We believe that our results can help, from the fabrication stage, in tailoring the appropriate ASI geometry for specific application purposes.
TL;DR: In this paper , the magnetic anisotropy in plane of 3x3 arrays constituted by square base nickel nanopillars (NPs), with D = 30 nm width and L = 120 nm long, is presented.
TL;DR: In this paper , the intricate interplay of spin dynamics between two different materials Co50Fe50 and Ni80Fe20 forming a BMC is exploited experimentally, and numerical simulations based on experimentally determined parameters demonstrate long-distance and high-speed spinwave propagation in such BMCs controlled by the filling fraction and offer a diode-like on/off mechanism determined by the applied magnetic field strength.
Abstract: Bicomponent magnonic crystals (BMCs) are metasurfaces formed using two dissimilar materials, which offer a richer manipulation of spin waves and promising spin-wave-based computation, communication, and signal processing. Here, the intricate interplay of spin dynamics between two different materials Co50Fe50 and Ni80Fe20 forming a BMC is exploited experimentally. Optimally engineered interface leads to interelement exchange coupling combined with the long-range dipolar coupling as confirmed by micromagnetic simulations. These couplings have been further tuned by systematic variation of the filling fraction of Co50Fe50 and Ni80Fe20 in the BMC. Moreover, the characteristic properties of spin-wave spectra are found to be highly sensitive to the bias-field strength. Further numerical simulations based on experimentally determined parameters demonstrate long-distance and high-speed spin-wave propagation in such BMCs controlled by the filling fraction and offer a diode-like on/off mechanism determined by the applied magnetic field strength. These observations will lead to the development of high-speed reconfigurable magnonic devices controlled by external parameters.
References
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TL;DR: In this paper, a review of spin-wave properties and properties is presented, where the crucial parameters to realize free Bloch states and how, by contrast, a controlled localization might allow us to gradually turn on and manipulate spinwave interactions in spinwave based devices in the future.
604 citations
TL;DR: The functional throughput of the magnonic logic gates is estimated and compared with the conventional transistor-based approach, offering a significant functional advantage over the traditional approach.
Abstract: We describe and analyse possible approaches to magnonic logic circuits and basic elements required for circuit construction. A distinctive feature of the magnonic circuitry is that information is transmitted by spin waves propagating in the magnetic waveguides without the use of electric current. The latter makes it possible to exploit spin wave phenomena for more efficient data transfer and enhanced logic functionality. We describe possible schemes for general computing and special task data processing. The functional throughput of the magnonic logic gates is estimated and compared with the conventional transistor-based approach. Magnonic logic circuits allow scaling down to the deep submicrometre range and THz frequency operation. The scaling is in favour of the magnonic circuits offering a significant functional advantage over the traditional approach. The disadvantages and problems of the spin wave devices are also discussed.
576 citations
TL;DR: This topical review addresses materials with a periodic modulation of magnetic parameters that give rise to artificially tailored band structures and allow unprecedented control of spin waves in microand nanostructured ferromagnetic materials.
Abstract: Research efforts addressing spin waves (magnons) in micro- and nanostructured ferromagnetic materials have increased tremendously in recent years. Corresponding experimental and theoretical work in magnonics faces significant challenges in that spin-wave dispersion relations are highly anisotropic and different magnetic states might be realized via, for example, the magnetic field history. At the same time, these features offer novel opportunities for wave control in solids going beyond photonics and plasmonics. In this topical review we address materials with a periodic modulation of magnetic parameters that give rise to artificially tailored band structures and allow unprecedented control of spin waves. In particular, we discuss recent achievements and perspectives of reconfigurable magnonic devices for which band structures can be reprogrammed during operation. Such characteristics might be useful for multifunctional microwave and logic devices operating over a broad frequency regime on either the macro- or nanoscale.
535 citations
TL;DR: In this paper, the propagation of spin waves through a periodic multilayered magnetic structure is analyzed, where it is assumed that the structure consists of ferromagnetic layers having the same thickness but different magnetizations.
290 citations
15 Jan 2020
TL;DR: Artificial spin ices as mentioned in this paper are metamaterials displaying fascinating phenomena arising from the collective behaviour of nanoscale magnets, such as frustration, phase transitions, and phase transitions that have previously been the domain of bulk spin crystals.
Abstract: 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. Artificial spin ices are metamaterials displaying fascinating phenomena arising from the collective behaviour of nanoscale magnets. We review recent developments in terms of emergent magnetic monopoles, phase transitions, dynamics and geometries, and discuss future directions for research and potential applications.
255 citations