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Related Experiment Videos

Flux closure structures in cobalt rings.

S P Li1, D Peyrade, M Natali

  • 1Laboratoire de Microstructures et de Microélectronique (CNRS), 196 Avenue H. Ravera, 92225 Bagneux Cedex, France.

Physical Review Letters
|February 15, 2001
PubMed
Summary

Magnetization reversal in cobalt magnetic rings shows a stable flux closure state. A metastable near single domain state emerges with larger diameters and thinner films during field reversal.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Submicron magnetic rings are crucial for data storage applications.
  • Understanding magnetization reversal dynamics is key to device performance.

Purpose of the Study:

  • To investigate magnetization reversal processes in cobalt submicron magnetic rings.
  • To determine the influence of ring dimensions on magnetic configurations.

Main Methods:

  • Fabrication of cobalt thin film rings using electron beam lithography and lift-off.
  • Magnetic characterization through magnetization reversal measurements.
  • Analysis of magnetic states under an in-plane applied field.

Main Results:

Related Experiment Videos

  • The flux closure state is the stable magnetization configuration for all ring dimensions (300-800 nm diameter, 10-50 nm thickness).
  • A metastable near single domain state is observed during reversal.
  • This metastable state is favored by increasing diameter and decreasing film thickness.

    • Conclusions:

    • Ring dimensions significantly impact magnetization reversal pathways.
    • Control over magnetic states in submicron rings is achievable by tuning geometry.
    • Findings contribute to the design of advanced magnetic memory devices.