Compositional Dependence of Exchange Anisotropy in PtxMn100-x/CoyFe100-y Films

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Bilayer films consisting of a 15 nm thick PtxMn100-x (x = 48 or 15) layer and a 2 nm thick Coy Fe100-y (0 ≤ y ≤ 90) layer were fabricated by ultrahigh-vacuum magnetron sputtering. The Pt48Mn52 and Pt15Mn85 films consisted of face-centered tetragonal (FCT) and face-centered cubic (FCC) structures, respectively. The effect of composition of CoFe films on the unidirectional anisotropy constant (Jk) in the PtxMn100-x/CoyFe100-y bilayer films and the optimum conditions for producing large Jkwere determined. The FCT and FCC PtMn films annealed at 370 °C for 6 h both exhibited maximum Jkwhen the film composition was Co70Fe30. Blocking temperatures of the FCT and FCC PtMn films were 410 °C and 160 °C, respectively. All the bilayer films possess flat surfaces. These results indicate that the obtained Pt-Mn films-with low roughness, high exchange bias, and high blocking temperature-will be practical candidates as the antiferromagnetic layer in spintronic devices.

Original languageEnglish
Article number8828068
JournalIEEE Magnetics Letters
Publication statusPublished - 2019


  • Spin electronics
  • antiferromagnetic
  • exchange anisotropy
  • ferromagnetic
  • spintronic applications
  • thin film


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