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Related Experiment Videos

Two-stage magnetization reversal in exchange biased bilayers.

C Leighton1, M R Fitzsimmons, P Yashar

  • 1Physics Department, University of California-San Diego, La Jolla, California 92093-0319. USA.

Physical Review Letters
|May 1, 2001
PubMed
Summary

Magnetization reversal in MnF(2)/Fe bilayers shows a two-stage coherent rotation process, leading to highly asymmetric hysteresis loops. This behavior is observed in high-quality crystalline samples.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Magnetism

Background:

  • Bilayer magnetic thin films are crucial for spintronic devices.
  • Understanding magnetization reversal mechanisms is key to device performance.

Purpose of the Study:

  • To investigate the magnetization reversal process in MnF(2)/Fe bilayers.
  • To elucidate the role of crystalline quality on magnetic behavior.

Main Methods:

  • Polarized neutron reflectometry
  • Magnetization measurements
  • Magnetotransport measurements

Main Results:

  • Observed asymmetric magnetization reversal.
  • Identified a two-stage coherent rotation process in high-quality samples.

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  • Demonstrated rotation to a stable state perpendicular to the cooling field.

    • Conclusions:

    • Crystalline quality significantly impacts magnetization reversal.
    • The two-stage rotation leads to distinctively asymmetric hysteresis loops.
    • Findings provide insights into controlling magnetic behavior in thin films.