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Applied physics letters, 2021-11, Vol.119 (19)
2021
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Autor(en) / Beteiligte
Titel
Tunable magnetic skyrmions in ferrimagnetic Mn4N
Ist Teil von
  • Applied physics letters, 2021-11, Vol.119 (19)
Ort / Verlag
Melville: American Institute of Physics
Erscheinungsjahr
2021
Quelle
AIP Journals
Beschreibungen/Notizen
  • Thin films of ferrimagnetic Mn4N are candidate materials to host magnetic skyrmions that have demonstrated thermal stability up to 450 °C. However, there are no experimental reports observing skyrmions in this system. Here, we discuss the results of sputter grown 15–17 nm Mn4N thin films on the MgO substrate capped with Pt1−xCux layers. Vibrating sample magnetometry measurement of out-of-plane hysteresis loops confirmed that magnetic properties are insensitive to the cap layer composition. Imaging based on magnetic force microscopy measurements observed 300–50 nm sized skyrmions, as the Cu concentration was increased from x = 0–0.9. We performed density functional theory calculations and found that the interfacial Dzyaloshinskii–Moriya interactions (iDMI) follow a trend: Mn4N/MgO(001) < Cu/Mn4N(001) < Pt/Mn4N(001). We infer from these calculations that x in the Pt1−xCux capping layer can serve as a robust tuning knob to tailor the iDMI and control the skyrmion size. This work provides guidance to achieve smaller Néel-type skyrmions in Mn4N thin films, which is an important step forward for building thermally stable skyrmionic devices.
Sprache
Englisch
Identifikatoren
ISSN: 0003-6951
eISSN: 1077-3118
DOI: 10.1063/5.0066375
Titel-ID: cdi_proquest_journals_2595278525

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