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Spin dynamics in a superconductor-ferromagnet proximity system.

C Bell1, S Milikisyants, M Huber

  • 1Magnetic and Superconducting Materials Group, Kamerlingh Onnes Laboratorium, Universiteit Leiden, The Netherlands.

Physical Review Letters
|March 21, 2008
PubMed
Summary

Superconductivity in niobium (Nb) thin films was found to influence ferromagnetic resonance in nickel-iron (Ni80Fe20) layers. This interaction, observed as a sharper resonance, suggests superconductivity impacts magnetic properties via spin transport.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Ferromagnetic resonance (FMR) is a key technique for studying magnetic properties of thin films.
  • Heterostructures combining superconducting and ferromagnetic materials offer unique phenomena due to spin interactions.
  • Niobium (Nb) is a superconductor, and Ni80Fe20 (Permalloy) is a widely studied soft ferromagnetic material.

Purpose of the Study:

  • To investigate the influence of superconductivity in Nb on the ferromagnetic resonance of adjacent Ni80Fe20 films.
  • To explore how changes in Nb's superconducting properties (temperature, thickness) affect the Ni80Fe20 layer.
  • To understand the underlying spin transport mechanisms responsible for the observed interactions.

Main Methods:

  • Fabrication of Ni80Fe20/Nb heterostructures using sputtering techniques.
  • Measurement of ferromagnetic resonance (FMR) spectra of the Ni80Fe20 films.
  • Systematic variation of temperature and Nb film thickness to probe superconducting transitions.

Main Results:

  • A distinct change in FMR linewidth (sharpening) was observed in the Ni80Fe20 layer below the superconducting transition temperature of Nb.
  • This resonance sharpening corresponds to a decrease in the effective Gilbert damping coefficient of the Ni80Fe20.
  • The observed effects were correlated with the superconducting properties of the Nb layer, indicating a direct influence.

Conclusions:

  • Superconductivity in the Nb layer significantly impacts the magnetic properties of the Ni80Fe20 ferromagnetic layer.
  • The findings support the spin-pumping model, where spin currents mediate the interaction between the superconductor and ferromagnet.
  • These results highlight the potential for controlling magnetic behavior in heterostructures through superconductivity.