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Related Experiment Videos

Perpendicular exchange bias of Co/Pt multilayers.

S Maat1, K Takano, S S Parkin

  • 1IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120, USA. smaat@us.ibm.com

Physical Review Letters
|August 11, 2001
PubMed
Summary

Exchange bias in magnetic multilayers was studied using Co/Pt and CoO. Measurements with an out-of-plane easy axis reveal new insights into interfacial spin behavior in ferromagnetic/antiferromagnetic systems.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Magnetism

Background:

  • Exchange bias is a phenomenon crucial for spintronic devices, typically studied in ferromagnetic/antiferromagnetic (F/AF) bilayers.
  • Standard measurements align the ferromagnetic layer's magnetization parallel to the AF interface, limiting probing capabilities.

Purpose of the Study:

  • To investigate exchange bias in Co/Pt multilayers with an out-of-plane magnetic easy axis, coupled with CoO.
  • To explore novel measurement configurations for probing spin projections at F/AF interfaces.

Main Methods:

  • Fabrication of Co/Pt multilayers with an out-of-plane easy axis.
  • Exchange bias measurements using field-cooling experiments with applied fields perpendicular and parallel to the sample plane.
  • Analysis of magnetic hysteresis loops for shifts and coercivity changes.

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Main Results:

  • Observed significant loop shifts and enhanced coercivities in Co/Pt/CoO systems under field cooling.
  • Demonstrated that out-of-plane easy axis measurements provide distinct information compared to in-plane configurations.
  • Experimental results align with modeling that considers interfacial spin configurations.

Conclusions:

  • Measurements of exchange bias with out-of-plane easy axis offer a complementary approach to conventional methods.
  • This technique allows for probing spin projections at ferromagnetic/antiferromagnetic interfaces, enhancing understanding of interfacial magnetism.
  • The findings contribute to the development of advanced magnetic materials and spintronic devices.