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Magnetic properties and phase stability in Co-Ni base alloy thin films

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Abstract

Co-Ni base thin films were deposited by reactive radio frequency magnetron sputtering in N2+Ar atmosphere at different \(P_{N_2}/P_{Ar}\) partial pressure ratios. Only the nitrogen content in the films changes when changing \(P_{N_2}/P_{Ar}\). Amorphous magnetic films can be obtained for compositions around N/Co=1–1.5, whereas higher N2 contents lead to non-magnetic nitride phases.

Significant changes in structural and magnetic properties are observed upon heating thin films in a TG(M) apparatus. Only the sample having a N/Co=1.5, when heat treated, appears to be made of a stable ferromagnetic phase. The N content is appropriate to keep Cr, Al and N, which exert an adverse effect on the magnetization of Co-Ni base alloys, out of the ferromagnetic phase in the form of separated nitride phases.

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Authors and Affiliations

  1. Department of Materials and Production Engineering, University of Napoli Federico II, Piazzale Tecchio 80, 80125, Napoli, Italy

    F. Branda, G. Luciani, A. Costantini & B. Silvestri

  2. Department of Materials Engineering and Industrial Technologies, University of Trento, Via Mesiano 77, 38050, Trento, Italy

    M. Leoni & P. Scardi

Authors
  1. F. Branda
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  2. G. Luciani
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  3. M. Leoni
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  4. A. Costantini
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  5. B. Silvestri
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  6. P. Scardi
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Corresponding author

Correspondence to F. Branda.

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PACS

68.55.-a; 68.60.Dv; 68.18.Jk; 75.70.Ak; 75.75.+a; 85.70.-w

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Branda, F., Luciani, G., Leoni, M. et al. Magnetic properties and phase stability in Co-Ni base alloy thin films. Appl. Phys. A 90, 695–699 (2008). https://doi.org/10.1007/s00339-007-4332-y

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  • DOI: https://doi.org/10.1007/s00339-007-4332-y

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