Room-Temperature Zero-Field <i>kπ-</i>Skyrmions and Their Field-Driven Evolutions in Chiral Nanodisks.
basic_science · Level V
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- Record sourced from PubMed, PMID 37942916.
- Also identified by DOI 10.1021/acs.nanolett.3c02746.
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Abstract
Target skyrmion, characterized by a central skyrmion surrounded by a series of concentric cylinder domains known as <i>kπ-</i>skyrmions (<i>k</i> ≥ 2), holds promise as a novel storage state in next-generation memories. However, target skyrmions comprising one or more concentric cylindrical domains have not been observed in chiral magnets, particularly at room temperature. In this study, we experimentally achieved <i>kπ-</i>skyrmions (<i>k</i> = 2, 3, and 4) with diameters of ∼220, 320, and 410 nm, respectively, and room-temperature stability under zero magnetic field by tightly confining these topological spin textures in β-Mn-type Co<sub>8</sub>Zn<sub>10</sub>Mn<sub>2</sub> nanodisks. The magnetic configurations and their field-driven evolutions were simultaneously investigated by using in situ off-axis electron holography. In combination with numerical simulations, we further investigated the dependence of <i>k</i><sub>max</sub> on the nanodisk diameter. These findings highlight the potential of <i>k</i>π-skyrmions as information carriers and offer insights into manipulation of <i>k</i>π-skyrmions in the future.