Magnetodynamic properties of dipole-coupled 1D magnonic crystals

Singh, Suraj Kumar; Wang, Xiang Rong; Kumar, Ankit; Qaiumzadeh, Alireza; Svedlindh, Peter; Tybell, Thomas; Wahlström, Erik

doi:10.1016/j.jmmm.2021.168376

“…Magnonics is an emerging field in spintronics and magnetic-based nanotechnology [12] that exhibits various features from quantum coherent phenomena [21][22][23][24], chiral magnonic spin transport, magnonic crystals [25][26][27][28], and ultrafast magnetization dynamics [29]. Nonlinear magnon interactions are ubiquitous and inevitable in magnetically ordered materials.…”

Section: Introductionmentioning

confidence: 99%

Thermal squeezing and nonlinear spectral shift of magnons in antiferromagnetic insulators

Shiranzaei

¹

,

Troncoso

²

,

Fransson

³

et al. 2022

New J. Phys.

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4

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We investigate the effect of magnon-magnon interactions on the dispersion and polarization of magnons in collinear antiferromagnetic (AF) insulators at finite temperatures. In two-sublattice AF systems with either uniaxial or biaxial magnetocrystalline anisotropies, we implement a self-consistent Hartree-Fock mean-field approximation to explore the nonlinear thermal interactions. The resulting nonlinear magnon interactions separate into two-magnon intra- and interband scattering processes. Furthermore, we compute the temperature dependence of the magnon bandgap and AF resonance modes due to nonlinear magnon interactions for square and hexagonal lattices. In addition, we study the effect of magnon interactions on the polarization of magnon modes. We find that although the noninteracting eigenmodes in the uniaxial case are circularly polarized, but in the presence of nonlinear thermal interactions the local U(1) symmetry of the Hamiltonian is broken. The attractive nonlinear interactions squeeze the low energy magnon modes and make them elliptical. In the biaxial case, on the other hand, the bare eigenmodes of low energy magnons are elliptically polarized but thermal nonlinear interactions squeeze them further. Direct measurements of the predicted temperature-dependent AF resonance modes and their polarization can be used as a tool to probe the nonlinear interactions. Our findings establish a framework for exploring the effect of thermal magnon interactions in technologically important magnetic systems, such as magnetic stability of recently discovered two-dimensional magnetic materials, coherent transport of magnons, Bose-Einstein condensation of magnons, and magnonic topological insulators.

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“…They can act as waveguides carrying the information encoded in spin waves 5,6 . Recently, many publications have focused on the spin waves in the sets of stripes, arranged in-plane periodically (in magnonic crystals [7][8][9][10] ) or quasiperiodically (in magnonic quasicrystals [11][12][13][14][15] ). The stripe systems act not only as waveguides.…”

mentioning

confidence: 99%

Shaping the spin wave spectra of planar 1D magnonic crystals by the geometrical constraints

Rychły-Gruszecka

¹

,

Walowski

²

,

Denker

³

et al. 2022

Sci Rep

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We present experimental and numerical studies demonstrating the influence of geometrical parameters on the fundamental spin-wave mode in planar 1D magnonic crystals. The investigated magnonic crystals consist of flat stripes separated by air gaps. The adjustment of geometrical parameters allows tailoring of the spin-wave frequencies. The width of stripes and the width of gaps between them affect spin-wave frequencies in two ways. First, directly by geometrical constraints confining the spin waves inside the stripes. Second, indirectly by spin-wave pinning, freeing the spin waves to a different extent on the edges of stripes. Experimentally, the fundamental spin-wave mode frequencies are measured using an all-optical pump-probe time-resolved magneto-optical Kerr-effect setup. Our studies address the problem of spin-wave confinement and spin-wave dipolar pinning in an array of coupled stripes. We show that the frequency of fundamental mode can be tuned to a large extent by adjusting the width of the stripes and the width of gaps between them.

show abstract

Shaping the spin wave spectra of planar 1D magnonic crystals by the geometrical constrains

Rychły-Gruszecka

¹

,

Walowski

²

,

Denker

³

et al. 2022

Preprint

0

View full text Add to dashboard Cite

We present experimental and numerical studies demonstrating the influence of geometrical parameters on the fundamental spin-wave mode in planar 1D magnonic crystals. The investigated magnonic crystals consist of flat stripes separated by air gaps. The adjustment of geometrical parameters allows tailoring of the spin-wave frequencies. The width of stripes and the width of gaps between them affect spin-wave frequencies in two ways. First, directly by geometrical constraints confining the spin waves inside the stripes. Second, indirectly by spin-wave pinning, freeing the spin waves to a different extent on the edges of stripes. Experimentally, the fundamental spin-wave mode frequencies are measured using an all-optical pump-probe time-resolved magneto-optical Kerr-effect setup. Our studies address the problem of spin-wave confinement and spin-wave dipolar pinning in an array of coupled stripes. We show that the frequency of fundamental mode can be tuned to a large extent by adjusting the width of the stripes and the width of gaps between them.

show abstract

Magnetodynamic properties of dipole-coupled 1D magnonic crystals

Cited by 3 publications

References 38 publications

Thermal squeezing and nonlinear spectral shift of magnons in antiferromagnetic insulators

Thermal squeezing and nonlinear spectral shift of magnons in antiferromagnetic insulators

Shaping the spin wave spectra of planar 1D magnonic crystals by the geometrical constraints

Shaping the spin wave spectra of planar 1D magnonic crystals by the geometrical constrains

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