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Parallel versus antiparallel interfacial coupling in exchange biased Co/FeF2.

Hendrik Ohldag1, Hongtao Shi, Elke Arenholz

  • 1Stanford Synchrotron Radiation Laboratory, Stanford University, P.O. Box 20450, Menlo Park, California 94025, USA.

Physical Review Letters
|February 21, 2006
PubMed
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This study reveals two distinct interfacial iron (Fe) magnetic moments in cobalt/iron difluoride (Co/FeF2) bilayers. One type is pinned and antiparallel to the ferromagnet, while the other is unpinned, parallel, and persists above the antiferromagnetic transition temperature.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Surface Science

Background:

  • Exchange bias in ferromagnet/antiferromagnet (FM/AFM) bilayers is crucial for spintronic devices.
  • Understanding interfacial magnetic moments is key to controlling exchange bias.
  • Previous studies lacked direct experimental evidence for distinct interfacial moment behaviors.

Purpose of the Study:

  • To experimentally distinguish and characterize different types of interfacial uncompensated iron (Fe) moments in Co/FeF2 bilayers.
  • To investigate the temperature dependence and magnetic coupling of these interfacial moments.
  • To correlate interfacial moment behavior with the observed exchange bias.

Main Methods:

  • Utilized soft x-ray magnetic dichroism (SXMD) spectroscopy.

Related Experiment Videos

  • Leveraged the surface and element specificity of SXMD.
  • Investigated Co/FeF2 bilayers across various temperatures.

    • Main Results:

    • Provided direct experimental evidence for two types of interfacial uncompensated Fe moments.
    • Identified pinned Fe moments coupled antiparallel to the ferromagnet, responsible for positive exchange bias and vanishing above the Néel temperature (T(N)).
    • Observed unpinned Fe moments coupled parallel to the ferromagnet, persisting up to 300 K and maintaining interfacial magnetic order above T(N).

    Conclusions:

    • The interfacial magnetic structure in exchange biased bilayers is more complex than previously assumed.
    • Distinct interfacial Fe moments exhibit different pinning behaviors and temperature dependencies.
    • These findings offer insights into the microscopic origin of exchange bias and magnetic ordering at interfaces.