posted on 2023-11-09, 13:04authored byYongsen Zhang, Meng Shi, Weiwei Wang, Xitong Xu, Mingliang Tian, Dongsheng Song, Haifeng Du
Target
skyrmion, characterized by a central skyrmion surrounded
by a series of concentric cylinder domains known as kπ-skyrmions (k ≥ 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 kπ-skyrmions
(k = 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 Co8Zn10Mn2 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 kmax on the nanodisk
diameter. These findings highlight the potential of kπ-skyrmions as information carriers and offer insights into
manipulation of kπ-skyrmions in the future.