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Reversing the training effect in exchange biased CoO/Co bilayers.

Steven Brems1, Dieter Buntinx, Kristiaan Temst

  • 1Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium.

Physical Review Letters
|October 26, 2005
PubMed
Summary

The training effect in cobalt oxide/cobalt bilayers can be partially reversed. Applying a perpendicular field during hysteresis measurements can erase antiferromagnetic domain memory, reinducing an untrained state.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Magnetism

Background:

  • Exchange bias in antiferromagnetic/ferromagnetic bilayers is crucial for spintronic devices.
  • The training effect, an evolution of exchange bias with cycling, impacts device performance.
  • Understanding the microscopic mechanisms of training and its reversibility is key.

Purpose of the Study:

  • To investigate the training effect in cobalt oxide/cobalt (CoO/Co) bilayers.
  • To explore the possibility of reversing the trained state and its underlying mechanisms.

Main Methods:

  • High-resolution anisotropic magnetoresistance (AMR) measurements.
  • Magnetization measurements (e.g., hysteresis loops).
  • Controlled application of external magnetic fields during measurements.

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Main Results:

  • An observed asymmetry in the first magnetization reversal process.
  • Training effect demonstrated in subsequent reversal processes.
  • Partial reinduction of the untrained state by applying an in-plane field perpendicular to the cooling field.
  • Hysteresis loops after perpendicular field application resemble initial loops but with reduced spin rotation.

Conclusions:

  • The training effect in CoO/Co bilayers is not entirely permanent.
  • Antiferromagnetic domains created during the first reversal can be partially erased.
  • This reversibility offers potential for dynamic control of spintronic device behavior.