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Scanning SQUID Study of Vortex Manipulation by Local Contact
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Coupled vortex oscillations in spatially separated permalloy squares.

Andreas Vogel1, Thomas Kamionka, Michael Martens

  • 1Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, 20355 Hamburg, Germany. andreas.vogel@physnet.uni-hamburg.de

Physical Review Letters
|April 27, 2011
PubMed
Summary

We studied how magnetic permalloy squares interact. Their magnetic vortex cores act like coupled oscillators, with interaction strength depending on distance and core alignment.

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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Micron-sized magnetic structures exhibit complex dynamics.
  • Stray field coupling is a key interaction mechanism in magnetic systems.
  • Understanding vortex core behavior is crucial for magnetic device applications.

Purpose of the Study:

  • To experimentally investigate the magnetization dynamics of coupled permalloy squares.
  • To analyze the behavior of vortex cores in response to external stimuli.
  • To determine the factors influencing the coupling strength between magnetic elements.

Main Methods:

  • Utilizing time-resolved scanning transmission X-ray microscopy (TR-TXM) for real-space mapping.
  • Exciting vortex cores with short magnetic-field pulses.
  • Analyzing the trajectories of vortex cores in micron-sized permalloy squares.

Main Results:

  • The system of coupled permalloy squares behaves like harmonic oscillators.
  • Coupling strength is dependent on the separation distance between the squares.
  • Vortex core polarization configuration significantly affects the coupling.
  • A weak response of the second vortex core was observed for equal core polarizations under rotating field excitation.

Conclusions:

  • The stray field coupling in permalloy squares leads to oscillator-like dynamics.
  • Precise control over separation and polarization is essential for tuning magnetic coupling.
  • These findings provide insights into the fundamental interactions governing magnetic nanostructures.