Search for ferromagnetism in undoped and cobalt-doped HfO2−δ

作者：M. S. Ramachandra Rao, Darshan C. Kundaliya, S. B. Ogale, Lichao Fu, Sascha Welz, Nigel D. Browning, V. Zaitsev, B. Varughese, C. A. Cardoso, Alexandra E. Curtin, S. Dhar, S. R. Shinde, T. Venkatesan, S. E. Lofland, S. A. Schwarz · 发表于：Applied Physics Letters · 年份：2006 · DOI：10.1063/1.2190909 · 被引用次数：42 · 研究领域：Semiconductor materials and devices、ZnO doping and properties、Ferroelectric and Negative Capacitance Devices

We report on the search for ferromagnetism in undoped and cobalt-doped high-k dielectric HfO2 films. Over a broad range of growth conditions, we do not observe ferromagnetism in undoped HfO2 films. On the other hand, we do observe room temperature ferromagnetism in dilutely Co-doped HfO2 films, but the origin of the same appears extrinsic (a Co rich surface layer) at least for the regime of growth conditions explored.