Magnetic skyrmion shape manipulation by perpendicular magnetic anisotropy excitation within geometrically confined nanostructures

Magnetic triangular bubble lattices in bismuth-doped yttrium iron garnet

“…For topologically nontrivial skyrmions, the Dzyaloshinskii-Moriya interaction (DMI) and magnetic anisotropy in the materials determine the size, shape, and stabilization of the magnetic structures, which, according to recent studies on the morphologies of skyrmions, are not circular. [17][18][19][20] For instance, it is shown that in Pt/Co/Ta multilayers, anisotropic DMI and in-plane anisotropy deform magnetic skyrmions to elliptical shapes. [19] Although bismuth is a remarkable material with strong spin-orbit coupling, [39] the DMI is considered weak in our Bi-YIG sample.…”

“…Very recently, the morphologies of skyrmions have attracted significant attention. Heart-shaped and polygonal magnetic skyrmions are proposed for improving the dynamic performances of skyrmion-based devices, [17,18] and elliptical skyrmions are experimentally realized in Pt/Co/Ta multilayers. [19] Moreover, skyrmion lattices with elliptical and square shapes are reported in bulk MnPtPdSn and GdRuSi magnets, [20][21][22] where their evolutions show similarities with the trivial bubbles reported in garnet materials.…”

Static and dynamic magnetic properties of circular and square cobalt nanodots in hexagonal cells

“…The data in the time domain were recorded for 20 ns with a step time of 5 ps, allowing a better spectral resolution of 0.05 GHz. 51,52 For FMR analysis, the imaginary part of the dynamical susceptibility is derived through a fast-Fourier transform (FFT) procedure. Specifically, the dynamic susceptibility χ ( ω ) at a frequency ω is defined as the ratio of the Fourier component, m y ( ω ), of the y -component of the spatially averaged magnetization m ( t ) and the Fourier component, h ( ω ), of the applied exciting field, 48 χ ( ω ) = m y ( ω )/ h ( ω ).…”

Tunable dispersion relations manipulated by strain in skyrmion-based magnonic crystals

“…[17,18] By considering the magnetoelastic coupling interaction, strain can be utilized to create skyrmions and annihilate skyrmions,and also modulate the configuration of stripe domains and skyrmions. [19][20][21] Additionally, from the applications of strain-induced surface acoustic waves (SAWs) another efficient method of generating and manipulating skyrmions has been found. [22][23][24] Particularly, the periodical skyrmion arrangement can form magnon bands and bandgaps.…”