Spin wave interferometer employing a local nonuniformity of the effective magnetic field

Vasiliev, S.; Kruglyak, V. V.; Sokolovskii, M. L.; Kuchko, A. N.

doi:10.1063/1.2740339

Cited by 90 publications

(58 citation statements)

References 22 publications

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“…HE PATTERNING of magnetic nanostructures, in order to steer [1]- [3], modulate [4], [5], or otherwise modify [6], [7] the properties of propagating spin waves, has led to the successful design of many elements of perceived magnonic computing architecture [8]- [12]. Indeed, it has been predicted [13] that this progress could eventually lead to the use of spin waves as information carriers within future data processing and communication technologies.…”

Section: Introductionmentioning

confidence: 99%

Generation of Propagating Spin Waves From Edges of Magnetic Nanostructures Pumped by Uniform Microwave Magnetic Field

Davies

Kruglyak

2016

IEEE Trans. Magn.

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Thin-film patterned magnetic nanostructures are widely employed within perceived magnonic device architectures to guide and / or manipulate spin waves for data processing and communication purposes. Here, using micromagnetic simulations, we explore how the internal magnetic field non-uniformity inherent to patterned magnetic nanostructures can also be exploited to create spin-wave sources. The spin-wave emission is achieved through the resonant excitation of finite sized regions of increased effective magnetic field formed near the edges of patterned structures. The phenomenon is rather universal and could be used to generate magneto-dipole, dipole-exchange and exchange dominated spin waves. Depending on the frequency of excitation and parameters of the nanostructures the emitted spin waves may form either highly-directional spin-wave caustic beams or more regular plane spin waves.

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Section: Introductionmentioning

confidence: 99%

Generation of Propagating Spin Waves From Edges of Magnetic Nanostructures Pumped by Uniform Microwave Magnetic Field

Davies

Kruglyak

2016

IEEE Trans. Magn.

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“…At the same time, it is known that spin waves ͑nonuniform waves of precessing magnetization͒ can have frequencies reaching several THzs in the exchange dominated regime, [12][13][14] although their coupling to uniform electromagnetic field has been traditionally considered weak. In particular, exchange spin waves come into play in studies of the high-frequency magnetic response of composites containing magnetic inclusions of cylindrical [15][16][17] and spherical [18][19][20][21][22] shapes.…”

Section: Introductionmentioning

confidence: 99%

Negative permeability due to exchange spin-wave resonances in thin magnetic films with surface pinning

2010

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We report a theory of the effective permeability of multilayered metamaterials containing thin ferromagnetic layers with magnetization pinned on either one or both surfaces. Because of the pinning and small film thickness, the lowest frequency magnetic resonances are due to nonuniform exchange spin waves with frequencies far above those expected for uniform ferromagnetic resonance in known magnetic materials. Yet, the coupling of the nonuniform spin-wave modes to the electromagnetic field is shown to be strong enough to lead, for magnetic parameters characteristic for conventional transition metal alloys, to negative values of the effective permeability at frequencies of several hundred gigahertzs. The permittivity of metals is already negative in this frequency range. Hence, this system represents a negative refractive index metamaterial at subterahertz frequencies. The ways by which to maximize the frequency and the strength of the negative magnetic response are analyzed.

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“…1,2 As such, a tremendous amount of research has been devoted in recent years to the development of spin-wave based technology, and many milestones have already been reached, with the realization of spin wave logic gates, [3][4][5] filters, 6 delay lines, 7 and multiplexors, 8 for example. Whilst the design of the aforementioned building blocks of magnonic circuits is indeed very important, it is an open question as to how they could be linked together in parallel, so that the devices could collectively perform increasingly complex computational tasks.…”

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Magnonic beam splitter: The building block of parallel magnonic circuitry

Садовников

Davies

Гришин

et al. 2015

Applied Physics Letters

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100

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We demonstrate a magnonic beam splitter that works by inter-converting magnetostatic surface and backward-volume spin waves propagating in orthogonal sections of a T-shaped yttrium iron garnet structure. The inter-conversion is enabled by the overlap of the surface and volume spin wave bands. This overlap results from the demagnetising field induced along the transversely magnetised section(-s) of the structure and the quantization of the transverse wave number of the propagating spin waves (which are therefore better described as waveguide modes). In agreement with numerical micromagnetic simulations, our Brillouin light scattering imaging experiments reveal that, depending on the frequency, the incident fundamental waveguide magnonic modes may also be converted into higher order waveguide modes. The magnonic beam splitter demonstrated here is an important step towards the development of parallel logic circuitry of magnonics.

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Spin wave interferometer employing a local nonuniformity of the effective magnetic field

Cited by 90 publications

References 22 publications

Generation of Propagating Spin Waves From Edges of Magnetic Nanostructures Pumped by Uniform Microwave Magnetic Field

Generation of Propagating Spin Waves From Edges of Magnetic Nanostructures Pumped by Uniform Microwave Magnetic Field

Negative permeability due to exchange spin-wave resonances in thin magnetic films with surface pinning

Magnonic beam splitter: The building block of parallel magnonic circuitry

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