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Article Dans Une Revue Small Année : 2020

Controlled Individual Skyrmion Nucleation at Artificial Defects Formed by Ion Irradiation

Résumé

Magnetic skyrmions are particle-like deformations in the magnetic texture. They have great potential as information carriers in spintronic devices because of their interesting topological properties and favourable motion under spin currents. This paper reports a new method of nucleating skyrmions at nanoscale defect sites, created in a controlled manner with focused ion beam irradiation, in polycrystalline magnetic multilayer samples with an interfacial Dzyaloshinskii-Moriya interaction. This new method has three notable advantages: 1) localisation of nucleation; 2) stability over a larger range of external field strengths, including stability at zero field; and 3) existence of skyrmions in material systems where, prior to defect fabrication, skyrmions were not previously obtained by field-cycling. Additionally, it is observed that the size of defect nucleated skyrmions is uninfluenced by the defect itself-provided that the artificial defects are controlled to be smaller than the inherent skyrmion size. All of these characteristics are expected to be useful towards the goal of realising a skyrmion-2 based spintronic device. This phenomenon is studied with a range of transmission electron microscopy techniques to probe quantitatively the magnetic behaviour at the defects with applied field and correlate this with the structural impact of the defects.
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Dates et versions

hal-02500770 , version 1 (06-03-2020)

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Kayla Fallon, Sean Hughes, Katharina Zeissler, William Legrand, Fernando R Ajejas, et al.. Controlled Individual Skyrmion Nucleation at Artificial Defects Formed by Ion Irradiation. Small, 2020, pp.1907450. ⟨10.1002/smll.201907450⟩. ⟨hal-02500770⟩
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