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Phase transformations in Pt/Fe bilayers during post annealing probed by resistometry.

O V Shamis1, N Y Safonova2, M M Voron3

  • 1Metal Physics Department, National Technical University of Ukraine 'Igor Sikorsky Kyiv Polytechnic Institute', Prospect Peremogy 37, 03056 Kyiv, Ukraine.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|April 6, 2019
PubMed
Summary
This summary is machine-generated.

Annealing Pt/Fe thin films transforms them into L1$_{0}$-FePt. Electrical resistivity measurements reveal phase formation and magnetic transitions, including Curie temperatures of 310 °C and 410 °C.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Platinum/Iron (Pt/Fe) bi-layered thin films are crucial for magnetic storage media.
  • Understanding phase transformations and magnetic properties during annealing is essential for optimizing material performance.

Purpose of the Study:

  • To investigate the phase transformations in Pt/Fe bi-layered thin films during annealing.
  • To correlate structural and chemical changes with electrical resistivity and magnetic properties.

Main Methods:

  • X-ray diffraction (XRD) for structural analysis.
  • Secondary neutral mass spectrometry (SNMS) for depth profiling.
  • Electrical resistivity measurements as a function of temperature.

Main Results:

  • Resistivity increases with temperature due to phonon scattering and phase formation.
  • Chemically disordered A1-phase and ordered L1$_{0}$-FePt phase formation were observed.
  • Curie temperatures for A1-FePt (310 °C) and L1$_{0}$-FePt (410 °C) were identified.

Conclusions:

  • Resistometry combined with XRD and SNMS provides insights into diffusion, phase formation, and stability.
  • The study demonstrates the utility of electrical resistivity for characterizing magnetic and structural transitions in Pt/Fe films.