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Inverse proximity effect in superconductor-ferromagnet bilayer structures.

Jing Xia1, V Shelukhin, M Karpovski

  • 1Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California, 94305, USA.

Physical Review Letters
|March 5, 2009
PubMed
Summary
This summary is machine-generated.

Researchers observed the inverse proximity effect in superconductor/ferromagnet bilayers. This effect shows ferromagnets inducing magnetization in superconductors, aligning with theoretical predictions.

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Area of Science:

  • Condensed matter physics
  • Magnetism and superconductivity

Background:

  • Proximity effect in superconductor-ferromagnet heterostructures is a key area of research.
  • Understanding interfacial phenomena is crucial for novel electronic devices.

Purpose of the Study:

  • To provide unambiguous experimental evidence for the inverse proximity effect.
  • To investigate the induction of magnetization in a superconductor by an adjacent ferromagnet.

Main Methods:

  • Utilized the polar Kerr effect with a zero-area-loop Sagnac magnetometer.
  • Fabricated superconductor/ferromagnet bilayers (Pb/Ni and Al/(Co-Pd)).
  • Ensured superconducting layer thickness exceeded optical penetration depth to isolate the inverse proximity effect.

Main Results:

  • Observed clear evidence of the inverse proximity effect in both Pb/Ni and Al/(Co-Pd) systems.
  • The induced magnetization in the superconducting layer was directly measured.
  • Experimental results, including sign, magnitude, and temperature dependence, matched theoretical predictions by Bergeret et al.

Conclusions:

  • The study confirms the existence of the inverse proximity effect.
  • Experimental findings validate theoretical models describing magnetism in superconductor-ferromagnet heterostructures.
  • This work advances the understanding of interfacial magnetism in condensed matter systems.