Spin-wave focusing induced by dipole-dipole interaction in synthetic antiferromagnets

Gallardo, R. A.; Alvarado-Seguel, P.; Kákay, Attila; Lindner, J.; Landeros, P.

doi:10.1103/physrevb.104.174417

Cited by 22 publications

(7 citation statements)

References 87 publications

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“…Hence, we can not only identify and label the peaks in the spectra but also understand the observed BLS intensity and the corresponding mode bandwidth. In fact, the dispersion bandwidth of any mode is proportional to the dynamic stray fields it produces and hence proportional to the mode intensity (i.e., power) [41][42][43] .…”

Section: B Mode Dynamics and Asi-film Couplingmentioning

confidence: 99%

“…5) 47 . The second effect is related to the dynamic dipolar field created by the precession of the magnetic moments in either layers, which we address as "dynamic coupling" 42,43 . In this case, at a given frequency, the phase profile of the mode in both layers is in some fixed relationship, the dynamic magnetization of each layer sharing some characteristics of the oscillation typical of the other layer (hybridization).…”

Section: B Mode Dynamics and Asi-film Couplingmentioning

confidence: 99%

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Dynamic coupling and spin-wave dispersions in a magnetic hybrid system made of an artificial spin-ice structure and an extended NiFe underlayer

et al. 2022

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We present a combined experimental and numerical study of the spin-wave dispersion in a NiFe artificial spin-ice (ASI) system consisting of an array of stadium-shaped nanoislands deposited on the top of a continuous NiFe film with non-magnetic spacer layers of varying thickness. The spin-wave dispersion, measured by wavevector resolved Brillouin light scattering spectroscopy in the Damon–Eshbach configuration, consists of a rich number of modes, with either stationary or propagating character. We find that the lowest frequency mode displays a bandwidth of ∼0.5 GHz, which is independent of the presence of the film underneath. On the contrary, the Brillouin light scattering intensity of some of the detected modes strongly depends on the presence of the extended thin-film underlayer. Micromagnetic simulations unveil the details of the dynamic coupling between the ASI lattice and film underlayer. Interestingly, the ASI lattice facilitates dynamics of the film either specific wavelengths or intensity modulation peculiar to the modes of the ASI elements imprinted in the film. Our results demonstrate that propagating spin waves can be modulated at the nanometer length scale by harnessing the dynamic mode coupling in the vertical, i.e., the out-of-plane direction of suitably designed magnonic structures.

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Section: B Mode Dynamics and Asi-film Couplingmentioning

confidence: 99%

Section: B Mode Dynamics and Asi-film Couplingmentioning

confidence: 99%

Dynamic coupling and spin-wave dispersions in a magnetic hybrid system made of an artificial spin-ice structure and an extended NiFe underlayer

et al. 2022

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“…For instance, a circular contour is obtained under the only presence of exchange interaction, which means that the wave propagates isotropically in preferred directions 84 . In contrast, the BV and DE behave differently under the dipolar interaction, channeling the wave’s energy in privileged directions 85 . In the case of a chiral interaction like an anisotropic exchange (DMI), or interlayer dynamic dipolar coupling, the wave’s energy can be channeled in only one direction due to the nonreciprocity induced by the chirality 84 , 85 .…”

Section: Resultsmentioning

confidence: 99%

“…In contrast, the BV and DE behave differently under the dipolar interaction, channeling the wave’s energy in privileged directions 85 . In the case of a chiral interaction like an anisotropic exchange (DMI), or interlayer dynamic dipolar coupling, the wave’s energy can be channeled in only one direction due to the nonreciprocity induced by the chirality 84 , 85 . In Fig.…”

Section: Resultsmentioning

confidence: 99%

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Omnidirectional flat bands in chiral magnonic crystals

Flores-Farías

Gallardo

Brevis

et al. 2022

Sci Rep

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The magnonic band structure of two-dimensional chiral magnonic crystals is theoretically investigated. The proposed metamaterial involves a three-dimensional architecture, where a thin ferromagnetic layer is in contact with a two-dimensional periodic array of heavy-metal square islands. When these two materials are in contact, an anti-symmetric exchange coupling known as the Dzyaloshinskii–Moriya interaction (DMI) arises, which generates nonreciprocal spin waves and chiral magnetic order. The Landau–Lifshitz equation and the plane-wave method are employed to study the dynamic magnetic behavior. A systematic variation of geometric parameters, the DMI constant, and the filling fraction allows the examination of spin-wave propagation features, such as the spatial profiles of the dynamic magnetization, the isofrequency contours, and group velocities. In this study, it is found that omnidirectional flat magnonic bands are induced by a sufficiently strong Dzyaloshinskii–Moriya interaction underneath the heavy-metal islands, where the spin excitations are active. The theoretical results were substantiated by micromagnetic simulations. These findings are relevant for envisioning applications associated with spin-wave-based logic devices, where the nonreciprocity and channeling of the spin waves are of fundamental and practical scientific interest.

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Three-terminal magnonic demultiplexer, power divider, and circulator

Zhao,

Feng,

et al. 2023

Journal of Magnetism and Magnetic Materials

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Spin-wave focusing induced by dipole-dipole interaction in synthetic antiferromagnets

Cited by 22 publications

References 87 publications

Dynamic coupling and spin-wave dispersions in a magnetic hybrid system made of an artificial spin-ice structure and an extended NiFe underlayer

Dynamic coupling and spin-wave dispersions in a magnetic hybrid system made of an artificial spin-ice structure and an extended NiFe underlayer

Omnidirectional flat bands in chiral magnonic crystals

Three-terminal magnonic demultiplexer, power divider, and circulator

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