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Updated: Dec 20, 2025

Fabrication of Magnetic Nanostructures on Silicon Nitride Membranes for Magnetic Vortex Studies Using Transmission Microscopy Techniques
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Tunable Magnetic Vortex Dynamics in Ion-Implanted Permalloy Disks.

Lakshmi Ramasubramanian1,2, Attila Kákay1, Ciarán Fowley1

  • 1Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, Dresden 01328, Germany.

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|May 23, 2020
PubMed
Summary

Spin-torque nano-oscillators offer low-noise wireless communication. Local ion implantation enables frequency tunability in these nanoscale devices, paving the way for cost-effective fabrication of dense networks.

Keywords:
electrical detectionfrequency tunabilityion implantationreduced saturation magnetizationvortex dynamics

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Area of Science:

  • Physics
  • Materials Science
  • Electrical Engineering

Background:

  • Nanoscale, low-phase-noise, tunable transmitter-receiver links are crucial for advancing wireless communication technologies.
  • Vortex-based spin-torque nano-oscillators (STNOs) are inherently low-noise due to their topologically protected magnetic structure.

Purpose of the Study:

  • To demonstrate frequency tunability in vortex-based STNOs using local ion implantation.
  • To explore ion irradiation as a cost-effective fabrication method for densely packed STNO networks.

Main Methods:

  • Excitation of the gyrotropic mode in STNOs using spin-polarized alternating currents.
  • Anisotropic magnetoresistance measurements to determine device frequencies.
  • Local ion implantation (chromium) to modify magnetic properties of permalloy disks.

Main Results:

  • Discrete frequencies were obtained from a single STNO device after ion implantation.
  • Chromium-implanted regions showed altered saturation magnetization compared to non-irradiated areas.
  • The altered magnetization directly influenced the resonance frequency based on the core's gyration area.

Conclusions:

  • Local ion implantation effectively tunes the frequency of vortex-based STNOs.
  • Ion irradiation is a viable, cost-effective alternative to lithography for fabricating tunable STNOs.
  • This method supports the development of densely packed, tunable nano-oscillator networks for wireless communication.