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Emergent chiral spin textures in centrosymmetric iron garnet with spin alignment constraints

ahmed mudhafer, southern technical university
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Chiral spin textures have emerged as a captivating class of topological matter. These intriguing structures harbor
localized and topologically protected magnetic textures, rendering them promising candidates for novel spin-
tronic applications. Here, the emergent chiral spin textures in an iron garnet with nanodisk configuration have
been micromagnatically simulated based on the Landau-Lifshitz-Gilbert equation (LLG) of COMSOL Multi-
physics. The modification of magnetic spin texture in the considered iron garnet has been controlled by intro-
ducing the interfacial Dzyaloshinskii-Moriya interaction (I-DMI) and spin alignment constraints as locally pinned
spins and curvilinear defects at edges. These boundary conditions induced interesting chiral textures not
commonly observed in such iron garnet due to its centrosymmetric crystal structure. The simulation results
showed the presence of two distinct regions of spin texture: inside and outside the pinning boundary. By sys-
tematically varying the DMI strength (D) with the size of the pinning boundary (Rpin) and the number of defects
(Ndef), the emerging chiral spin textures have been explored and reported, including the existence of ramified
helical stripes, skyrmions, and skyrmions-like textures such as elongated skyrmions, chiral horseshoe domains,
biskyrmions and target skyrmions (TSk) (2π-TSk and 3π-TSk). Also, it has been reported that various collapses
occur in the final spin texture states, leading to the transition from one state to another when varying the values
of Rpin and Ndef with D.

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