Generation of Squarelike Skyrmion Bubbles and Configuration Manipulation in Rare‐Earth DyFe 11 Mo Magnet

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ABSTRACT Topological magnetic skyrmions with nanoscale particle‐like characteristics and high manipulability have been intensively studied as promising candidates for next‐generation high‐density information units. Besides the chiral skyrmions determined by Dzyaloshinskii‐Moriya interaction (DMI), the energy competition between magnetic anisotropy and dipolar interactions has demonstrated rich freedoms for generating various topological spin configurations. Normally, circular configurations are favored for topological particles, leaving the square configuration only rarely observed in chiral antiskyrmions due to the anisotropic DMI so far. Here, we found that magnetoelectric manipulation can stabilize a variety of squarelike skyrmion bubbles at zero field in centrosymmetric DyFe 11 Mo magnet. Furthermore, by combining analysis of in situ Lorentz transmission electron microscopy (L‐TEM) images and micromagnetic simulations, the configuration transition between squarelike and circular skyrmion bubbles has been realized with the underlying mechanism clarified . The magnetic competition mediated by significant 3d‐4f electron interactions between rare‐earth and transition‐metal (RE‐TM) elements serves as the microscopic origin for magnetic texture manipulation, highlighting the extended application of the RE‐TM based magnets in exploring multiple topological spin textures and spintronic functions.

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