Direct Observation of Magnetic Skyrmions and Their Current-Induced Dynamics in Epitaxial Single-Crystal Oxide Films.
basic_science · Level V
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- Record sourced from PubMed, PMID 37158610.
- Also identified by DOI 10.1021/acs.nanolett.3c00342.
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Abstract
Magnetic skyrmions are scarcely investigated for single-crystal quality films, for which skyrmions may have a remarkable performance. Even in the limited studies in this aspect, the skyrmions are usually probed by the topological Hall effect, missing important information on dynamic properties. Here, we present a comprehensive investigation on the generation/manipulation of magnetic skyrmions in La<sub>0.67</sub>Ba<sub>0.33</sub>MnO<sub>3</sub> single-crystal films. Using the technique of magnetic force microscopy, the current-driven skyrmion dynamics are directly observed. Unlike isolated skyrmions produced by magnetic field alone, closely packed skyrmions can be generated by electric pulses in a magnetic background, with a high density (∼60/μm<sup>2</sup>) and a small size (dozens of nanometers). The threshold current moving skyrmions is ∼2.3 × 10<sup>4</sup> A/cm<sup>2</sup>, 2-3 orders of magnitude lower than that required by metallic multilayers or van der Waals ferromagnetic heterostructures. Our work demonstrates the great potential of single-crystal oxide films in developing skyrmion-based devices.