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Scanning SQUID Study of Vortex Manipulation by Local Contact
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Controlling double vortex states in low-dimensional dipolar systems.

S Prosandeev1, L Bellaiche

  • 1Physics Department, University of Arkansas, Fayetteville, Arkansas 72701, USA.

Physical Review Letters
|October 15, 2008
PubMed
Summary
This summary is machine-generated.

Chirality reversal in ferromagnetic double vortex states is controlled by magnetic fields, forming intermediate states. This process enables counterclockwise hysteresis loops and offers insights for ferroelectric nanostructures.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Ferromagnetic and ferroelectric nanostructures exhibit complex behaviors like vortex states.
  • Understanding chirality reversal is crucial for developing advanced magnetic and electric memory devices.

Purpose of the Study:

  • To investigate the chirality reversal process in double vortex states of ferromagnetic hysterons under in-plane magnetic fields.
  • To explore the formation of intermediate states during chirality reversal.
  • To compare the control of double vortex states in ferromagnetic versus ferroelectric nanostructures.

Main Methods:

  • Utilized computational simulations to model the behavior of double vortex states.
  • Applied in-plane magnetic fields to induce and observe chirality reversal.
  • Analyzed the formation and role of intermediate states in the hysteresis loop.

Main Results:

  • The chirality reversal process involves the formation of four distinct intermediate states, including the initial states.
  • A specific intermediate state dictates that hysteresis loops can only form in a counterclockwise direction.
  • Double vortex states in ferroelectric nanostructures can be controlled by electric fields, showing key differences from ferromagnetic systems.

Conclusions:

  • The study elucidates the mechanism of chirality reversal in ferromagnetic double vortex states, highlighting the critical role of intermediate states.
  • The findings provide a pathway for controlling hysteresis loop direction in magnetic nanostructures.
  • Comparison with ferroelectric systems suggests potential for tailored vortex state control in different material classes.