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Modelling nanomagnet vertex dynamics through Coulomb charges.

Samuel D Slöetjes1, Matías P Grassi1, Vassilios Kapaklis1

  • 1Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|June 21, 2024
PubMed
Summary
This summary is machine-generated.

We modeled nanomagnet vertices in artificial spin ices using magnetic charges to study magnetization dynamics. Our findings reveal magnonic regimes and state transitions linked to zero-modes, validated by simulations.

Keywords:
artificial spin icemagnetization dynamicsmagnetization texturemagnonicsmodelling

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Computational Physics

Background:

  • Artificial spin ices are engineered magnetic metamaterials with complex spin configurations.
  • Nanomagnet vertices are critical structural elements influencing the collective magnetic behavior.
  • Understanding magnetization dynamics is crucial for potential applications in data storage and neuromorphic computing.

Purpose of the Study:

  • To develop a simplified model of magnetization dynamics in nanomagnet vertices.
  • To investigate the energy landscape, curvatures, and fundamental modes of these systems.
  • To identify magnonic regimes and magnetization state transitions using a charge model.

Main Methods:

  • Development of a simplified model representing edge magnetization via magnetic charges.
  • Analysis of the energy landscape and its associated curvatures.
  • Comparison of model predictions with results from micromagnetic simulations.

Main Results:

  • Identification of specific magnonic regimes within the nanomagnet vertex system.
  • Discovery of magnetization state transitions characterized by the presence of zero-modes.
  • Demonstration of a simplified magnetic charge model's validity through agreement with micromagnetic simulations.

Conclusions:

  • The simplified magnetic charge model effectively captures key aspects of magnetization dynamics in nanomagnet vertices.
  • Zero-modes provide a framework, consistent with Landau theory, for understanding transitions between magnetic states.
  • The study offers insights into the fundamental physics governing artificial spin ice systems.