Confined magnetoelastic waves in thin waveguides

Vanderveken, Frederic; Mulkers, Jeroen; Leliaert, Jonathan; Waeyenberge, Bartel Van; Sorée, Bart; Zografos, Odysseas; Ciubotaru, Florin; Adelmann, Christoph

doi:10.1103/physrevb.103.054439

Cited by 17 publications

(15 citation statements)

References 79 publications

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“…In fact, the dispersion relation of SW modes in a longitudinally magnetized stripe can be calculated analytically neglecting the quantization along the thickness direction [ 20 , 30 , 31 , 32 , 33 ], with the formula given by

where

is the gyromagnetic ratio,

, the wave numbers

where d is the thickness of the wire, and

. Note that

, which is quantized and yields multiple branches of the dispersion.…”

Section: Resultsmentioning

confidence: 99%

Micromagnetic Study on Branch Hybridizations of Spin-Wave Modes in Ferromagnetic Nanostrips

et al. 2022

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Magnonics is an emerging field in spintronics, aiming at the development of new-concept magnetic devices processing information via the manipulation of spin waves (SWs) in magnetic nanostructures. One of the most popular SW waveguides exploited currently is ferromagnetic nanostrips. Due to quantization caused by the lateral confinements, the dispersion of SWs propagating in a strip is characterized by a multi-branched structure. Consequently, SWs excited in the system involve superpositions of degenerate modes from different branches of the dispersion curves. In this work, we theoretically study the SW branch hybridization effect for two types of excitation methods, either by using a local oscillating magnetic field or a fast-moving field pulse. The former is based on the resonance effect and the latter on the Cherenkov-like emission mechanism. Micromagnetic simulations yield a variety of SW profiles with rather complex structures, which can be well explained by mode superpositions. These results draw attention to the significance of the SW branch hybridization effect when dealing with SWs in nanostrips and provide new aspects for the manipulation of SWs.

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where

is the gyromagnetic ratio,

, the wave numbers

where d is the thickness of the wire, and

. Note that

, which is quantized and yields multiple branches of the dispersion.…”

Section: Resultsmentioning

confidence: 99%

Micromagnetic Study on Branch Hybridizations of Spin-Wave Modes in Ferromagnetic Nanostrips

et al. 2022

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“…The authors demonstrated in Ref. 71 that the extension can be used to simulate confined magneto-elastic waves in thin waveguides. It would be nice to briefly mention here if there are other geometries where their extension can (or cannot) be used.…”

Section: Discussionmentioning

confidence: 99%

“…Below, we reproduce verbatim the input script (including annotations) used to generate the data in Figure 7 in Ref. 71 as an example. As output, the input script generates data in the .ovf format.…”

Section: Use Casesmentioning

confidence: 99%

Finite difference magnetoelastic simulator

Vanderveken¹,

Mulkers²,

Leliaert³

et al. 2021

Open Res Europe

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We describe an extension of the micromagnetic finite difference simulation software MuMax3 to solve elasto-magneto-dynamical problems. The new module allows for numerical simulations of magnetization and displacement dynamics in magnetostrictive materials and structures, including both direct and inverse magnetostriction. The theoretical background is introduced, and the implementation of the extension is discussed. The magnetoelastic extension of MuMax3 is freely available under the GNU General Public License v3.

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“…In the latter case, the elastic medium should form a thin film or a waveguide grown on a low-impedance substrate (see, e.g., ref. [34]) to guarantee that a sufficient fraction of the elastic wave energy propagates in a SAFM (in the case of surface acoustic waves it is achieved naturally by the wave localization). Of course, the optimal operation conditions for different elastic wave modes (for instance, the angle φ between the wave propagation direction and SAFM magnetization) will be different.…”

Section: Wwwadvelectronicmatdementioning

confidence: 99%

Phase Nonreciprocity of Microwave‐Frequency Surface Acoustic Waves in Hybrid Heterostructures with Magnetoelastic Coupling

Verba

Bankowski

Meitzler

et al. 2021

Adv Elect Materials

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reciprocal SAW devices, in spite of the fact that pure acoustic waves in solids are reciprocal. [4][5][6] Although nonreciprocity of magnetoelastic waves (e.g., hybridized SAW-SW) have been studied for a long time, [7,8] it is only recently the practically usable levels (giant and/or ultra-wideband) of nonreciprocity of SAW propagation losses have been achieved. [9][10][11][12][13][14] These novel results open a way for the development of efficient microwave SAW isolators, compatible with the modern SAW technology.Isolators, however, are not the only nonreciprocal devices, that are necessary for the further development of microwavefrequency SAW-based signal processing technology. Circulators and nonreciprocal phase shifters are also needed.Although there exists a method to build a circulator using several isolators, [15,16] this method is hardly compatible with the existing SAW technology. Indeed, the realization of an isolator-based circulator requires the utilization of the Wilkinson-type power splitters, which are known for electromagnetic waves, but have not been realized (and even theoretically studied) for SAWs. It is clear, that additional transformations from SAW to electromagnetic wave and back eliminate almost all the advantages of the SAW-based devices.A standard circulator scheme, used, in particular, in electromagnetic [17] and ultrasonic [18] devices, relies, in contrast, on the phase nonreciprocity of waves, when the phase accumulation for waves propagating in opposite direction is not the same. This phase effect is, of course, caused by the nonreciprocity of the wave dispersion relation. As it is explained below, it is not trivial to achieve the practically useful levels of phase nonreciprocity of a hybridized magnetoelastic wave, because, usually, the strongly hybridized acoustic waves have prohibitively large losses, that are much larger than the losses of pure SAW. In this work we demonstrate, how this problem can be solved by the utilization of magnetoelastic coupling between SAW and highly nonreciprocal SWs, which could exist, for instance, in a synthetic antiferromagnet (SAFM), and discuss possible realization of nonreciprocal SAW phase shifters and circulators.

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Confined magnetoelastic waves in thin waveguides

Cited by 17 publications

References 79 publications

Micromagnetic Study on Branch Hybridizations of Spin-Wave Modes in Ferromagnetic Nanostrips

Micromagnetic Study on Branch Hybridizations of Spin-Wave Modes in Ferromagnetic Nanostrips

Finite difference magnetoelastic simulator

Phase Nonreciprocity of Microwave‐Frequency Surface Acoustic Waves in Hybrid Heterostructures with Magnetoelastic Coupling

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