Atomic layer stacking structure and negative uniaxial magnetocrystalline anisotropy of Co<sub>100−<i>x</i></sub>Ir<sub><i>x</i></sub> sputtered films

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  • Nozawa N.
    Department of Electronic Engineering, Graduate School of Engineering, Tohoku University
  • Saito S.
    Department of Electronic Engineering, Graduate School of Engineering, Tohoku University
  • Kimura T.
    Department of Electronic Engineering, Graduate School of Engineering, Tohoku University
  • Shibuya K.
    Foundation for Promotion of Material Science and Technology of Japan
  • Hoshino K.
    Foundation for Promotion of Material Science and Technology of Japan
  • Hinata S.
    Department of Electronic Engineering, Graduate School of Engineering, Tohoku University
  • Takahashi M.
    New Industry Creation Hatchery Center, Tohoku University

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  • Atomic layer stacking structure and negative uniaxial magnetocrystalline anisotropy of Co₁₀₀[-x]Ir[x] sputtered films
  • Atomic layer stacking structure and negative uniaxial magnetocrystalline anisotropy of Co100^|^minus;xIrx sputtered films

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The negative uniaxial magnetocrystalline anisotropy (Ku) was evaluated for various compositions of Co100−xIrx thin films with respect to the atomic layer stacking structure. Pure Co film fabricated at a substrate temperature (Tsub) of 600 ℃ was found to have a positive Ku of 6.1×106 erg/cm3. With increasing x, the sign of Ku changed from positive to negative, and the negative Ku took a maximum value of −9.6×106 erg/cm3 at around x = 20 at. % for films fabricated at Tsub = 600 ℃. Adding more Ir decreased the absolute value of the negative Ku which became 0 over x = 50 at. %. X−ray diffraction analysis and scanning transmission electron microscopy revealed that the atomic layer stacking structure of the Co100−xIrx films changed from −A−B−A−B− (hcp) to −A−B−C−A−B−C− (fcc) stacking with increasing Ir content. Moreover, Co80Ir20 grains were revealed to consist of 2 kinds of randomly located composition−modulated atomic layers, nearly pure−Co and pure−Ir layers, while Co and Co50Ir50 had disordered structures. In this paper, a new perspective on the atomic layered structure with superlattice diffraction, which is different from the conventional “ordered structure”, is discussed.

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