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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
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Room Temperature Magnetic Skyrmions in Gradient-Composition Engineered CoPt Single Layers.

Adam Erickson1, Qihan Zhang2, Hamed Vakili3

  • 1Department of Mechanical & Materials Engineering, University of Nebraska-Lincoln, 900 N 16th Street, W342 NH, Lincoln, Nebraska 68588, United States.

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|October 29, 2024
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Summary

Researchers observed room-temperature magnetic skyrmions using gradient Dzyaloshinskii-Moriya interaction (g-DMI) in CoPt films. This breakthrough enables potential applications in energy-efficient electronic devices.

Keywords:
CoPtDzyaloshinskii−Moriya interactionnitrogen vacancyskyrmiontopological Hall effecttopological stability

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Magnetic skyrmions are topologically protected quasiparticles stabilized by Dzyaloshinskii-Moriya interaction (DMI).
  • Current DMI methods limit skyrmion applications due to thickness dependence and low-temperature requirements.
  • Room-temperature (RT) skyrmion manipulation is crucial for energy-efficient devices.

Purpose of the Study:

  • To demonstrate RT magnetic skyrmions stabilized by gradient DMI (g-DMI).
  • To explore the potential of CoPt single-layer films for hosting stable RT skyrmions.
  • To investigate methods for tuning DMI for practical skyrmion applications.

Main Methods:

  • Composition gradient-engineering of CoPt single-layer films.
  • Utilizing topological Hall effect, magnetic force microscopy, and nitrogen-vacancy scanning magnetometry.
  • Micromagnetic simulations and analytical magnetization reconstruction for skyrmion characterization.

Main Results:

  • Observation of stable RT skyrmions in gradient DMI CoPt films.
  • Skyrmions confirmed to be nearly Bloch-type and stable over a wide magnetic field range.
  • Observation of skyrmion pairs, suggesting potential skyrmion-antiskyrmion interactions.

Conclusions:

  • Gradient DMI is an effective strategy for stabilizing RT magnetic skyrmions.
  • CoPt single-layer films are promising materials for hosting RT skyrmions.
  • Tuning g-DMI via gradient polarity and material choice expands possibilities for RT skyrmion realization.