Search for ferromagnetism in undoped and cobalt-doped Hf O 2-δ

M. S.Ramachandra Rao, Darshan C. Kundaliya, S. B. Ogale, L. F. Fu, S. J. Welz, N. D. Browning, V. Zaitsev, B. Varughese, C. A. Cardoso, A. Curtin, S. Dhar, S. R. Shinde, T. Venkatesan, S. E. Lofland, S. A. Schwarz

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Abstract

We report on the search for ferromagnetism in undoped and cobalt-doped high- k dielectric Hf O2 films. Over a broad range of growth conditions, we do not observe ferromagnetism in undoped Hf O2 films. On the other hand, we do observe room temperature ferromagnetism in dilutely Co-doped Hf O2 films, but the origin of the same appears extrinsic (a Co rich surface layer) at least for the regime of growth conditions explored.

Original languageEnglish (US)
Article number142505
JournalApplied Physics Letters
Volume88
Issue number14
DOIs
StatePublished - Apr 3 2006

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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