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Disorder-induced microscopic magnetic memory.

M S Pierce1, C R Buechler, L B Sorensen

  • 1Department of Physics, University of Washington, Seattle, WA 98195, USA.

Physical Review Letters
|February 9, 2005
PubMed
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Disorder influences magnetic memory in Co/Pt films. Increasing disorder enhances both major loop return point memory (RPM) and complementary point memory (CPM), revealing microscopic memory effects.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Understanding magnetic memory is crucial for data storage technologies.
  • Disorder is known to affect magnetic properties, but its precise influence on microscopic memory is not fully understood.
  • Co/Pt multilayer films exhibit perpendicular anisotropy, making them relevant for magnetic recording media.

Purpose of the Study:

  • To experimentally investigate the impact of varying levels of disorder on magnetic memory in Co/Pt multilayer films.
  • To quantify the influence of disorder on major loop return point memory (RPM) and complementary point memory (CPM).
  • To compare experimental findings with theoretical predictions regarding disorder effects on magnetic memory.

Main Methods:

  • Utilized coherent x-ray speckle metrology for precise measurements.

Related Experiment Videos

  • Studied a series of Co/Pt multilayer films with controlled perpendicular anisotropy.
  • Analyzed domain structures and their memory behavior under field cycling at different disorder levels.

    • Main Results:

    • In the low disorder regime, domain structures exhibited no memory (no RPM or CPM).
    • As disorder increased, both RPM and CPM emerged and subsequently saturated.
    • Demonstrated the first direct, ensemble-sensitive experimental evidence of disorder's effect on microscopic magnetic memory.

    Conclusions:

    • Disorder plays a critical role in establishing microscopic magnetic memory in Co/Pt films.
    • The observed onset and saturation of RPM and CPM with increasing disorder provide valuable data for theoretical models.
    • This study offers new insights into the fundamental mechanisms governing magnetic memory in disordered systems.