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Related Experiment Videos

Layer-resolved magnetic moments in Ni/Pt multilayers

Wilhelm1, Poulopoulos, Ceballos

  • 1Institut fur Experimentalphysik, Freie Universitat Berlin, Arnimallee 14, D-14195 Berlin-Dahlem, Germany.

Physical Review Letters
|September 16, 2000
PubMed
Summary

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Magnetic moments in nickel/platinum multilayers were investigated. Researchers found induced platinum magnetic moments at interfaces, with enhanced nickel magnetization, challenging previous assumptions about dead layers.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Surface Science

Background:

  • Understanding magnetic properties of multilayered systems is crucial for advanced spintronic devices.
  • Nickel/Platinum (Ni/Pt) multilayers are of interest due to their potential magnetic and electronic applications.
  • Previous studies suggested the possibility of magnetically 'dead' layers in such systems.

Purpose of the Study:

  • To thoroughly investigate the magnetic moments within Ni/Pt multilayers.
  • To determine the layer-resolved magnetic moment profile.
  • To compare experimental findings with theoretical ab initio calculations.

Main Methods:

  • SQUID magnetometry was employed to measure overall sample magnetization.
  • X-ray magnetic circular dichroism (XMCD) was used to differentiate Ni and Pt magnetic contributions.

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  • Ab initio band-structure calculations provided theoretical insights and comparisons.

    • Main Results:

    • XMCD revealed induced magnetic moments in Platinum (Pt) layers, primarily localized at the Ni/Pt interfaces.
    • No evidence of magnetically 'dead' Nickel (Ni) layers was found.
    • The magnetization per unit volume of Ni was observed to be slightly enhanced compared to bulk NiPt alloys.

    Conclusions:

    • Ni/Pt multilayers exhibit interfacial magnetism originating from Pt.
    • The absence of dead Ni layers suggests robust magnetism throughout the Ni component.
    • The findings provide a detailed understanding of magnetic moment distribution in Ni/Pt systems, relevant for materials design.