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Title: Search for ferromagnetism in undoped and cobalt-doped HfO{sub 2-{delta}}

Abstract

We report on the search for ferromagnetism in undoped and cobalt-doped high-k dielectric HfO{sub 2} films. Over a broad range of growth conditions, we do not observe ferromagnetism in undoped HfO{sub 2} films. On the other hand, we do observe room temperature ferromagnetism in dilutely Co-doped HfO{sub 2} films, but the origin of the same appears extrinsic (a Co rich surface layer) at least for the regime of growth conditions explored.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1];  [2];  [2];  [2];  [2];  [2] more »;  [2] « less
  1. Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742-4111 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
20779164
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 88; Journal Issue: 14; Other Information: DOI: 10.1063/1.2190909; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COBALT; DIELECTRIC MATERIALS; DOPED MATERIALS; ENERGY LOSSES; FERROMAGNETIC MATERIALS; FERROMAGNETISM; HAFNIUM OXIDES; ION MICROPROBE ANALYSIS; MASS SPECTRA; MASS SPECTROSCOPY; SCANNING ELECTRON MICROSCOPY; TEMPERATURE RANGE 0273-0400 K; THIN FILMS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY PHOTOELECTRON SPECTROSCOPY

Citation Formats

Ramachandra Rao, M.S., Kundaliya, Darshan C., Ogale, S.B., Fu, L.F., Welz, S.J., Browning, N.D., Zaitsev, V., Varughese, B., Cardoso, C.A., Curtin, A., Dhar, S., Shinde, S.R., Venkatesan, T., Lofland, S.E., Schwarz, S.A., Department of Chemical Engineering and Materials Science, University of California at Davis, California 95616 and Lawrence Berkeley National Laboratory, NCEM, One Cyclotron Road, Berkeley, California 94720, Department of Material Science and Engineering, Stony Brook University, Stony Brook, New York 11790, Department of Chemistry, University of Maryland, College Park, Maryland 20742, Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742-4111, Department of Physics, Rowan University, 201 Mullica Hill Road, New Jersey 08028-1701, and Department of Physics, Queens College of CUNY, Flushing, New York 11367. Search for ferromagnetism in undoped and cobalt-doped HfO{sub 2-{delta}}. United States: N. p., 2006. Web. doi:10.1063/1.2190909.
Ramachandra Rao, M.S., Kundaliya, Darshan C., Ogale, S.B., Fu, L.F., Welz, S.J., Browning, N.D., Zaitsev, V., Varughese, B., Cardoso, C.A., Curtin, A., Dhar, S., Shinde, S.R., Venkatesan, T., Lofland, S.E., Schwarz, S.A., Department of Chemical Engineering and Materials Science, University of California at Davis, California 95616 and Lawrence Berkeley National Laboratory, NCEM, One Cyclotron Road, Berkeley, California 94720, Department of Material Science and Engineering, Stony Brook University, Stony Brook, New York 11790, Department of Chemistry, University of Maryland, College Park, Maryland 20742, Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742-4111, Department of Physics, Rowan University, 201 Mullica Hill Road, New Jersey 08028-1701, & Department of Physics, Queens College of CUNY, Flushing, New York 11367. Search for ferromagnetism in undoped and cobalt-doped HfO{sub 2-{delta}}. United States. doi:10.1063/1.2190909.
Ramachandra Rao, M.S., Kundaliya, Darshan C., Ogale, S.B., Fu, L.F., Welz, S.J., Browning, N.D., Zaitsev, V., Varughese, B., Cardoso, C.A., Curtin, A., Dhar, S., Shinde, S.R., Venkatesan, T., Lofland, S.E., Schwarz, S.A., Department of Chemical Engineering and Materials Science, University of California at Davis, California 95616 and Lawrence Berkeley National Laboratory, NCEM, One Cyclotron Road, Berkeley, California 94720, Department of Material Science and Engineering, Stony Brook University, Stony Brook, New York 11790, Department of Chemistry, University of Maryland, College Park, Maryland 20742, Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742-4111, Department of Physics, Rowan University, 201 Mullica Hill Road, New Jersey 08028-1701, and Department of Physics, Queens College of CUNY, Flushing, New York 11367. Mon . "Search for ferromagnetism in undoped and cobalt-doped HfO{sub 2-{delta}}". United States. doi:10.1063/1.2190909.
@article{osti_20779164,
title = {Search for ferromagnetism in undoped and cobalt-doped HfO{sub 2-{delta}}},
author = {Ramachandra Rao, M.S. and Kundaliya, Darshan C. and Ogale, S.B. and Fu, L.F. and Welz, S.J. and Browning, N.D. and Zaitsev, V. and Varughese, B. and Cardoso, C.A. and Curtin, A. and Dhar, S. and Shinde, S.R. and Venkatesan, T. and Lofland, S.E. and Schwarz, S.A. and Department of Chemical Engineering and Materials Science, University of California at Davis, California 95616 and Lawrence Berkeley National Laboratory, NCEM, One Cyclotron Road, Berkeley, California 94720 and Department of Material Science and Engineering, Stony Brook University, Stony Brook, New York 11790 and Department of Chemistry, University of Maryland, College Park, Maryland 20742 and Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742-4111 and Department of Physics, Rowan University, 201 Mullica Hill Road, New Jersey 08028-1701 and Department of Physics, Queens College of CUNY, Flushing, New York 11367},
abstractNote = {We report on the search for ferromagnetism in undoped and cobalt-doped high-k dielectric HfO{sub 2} films. Over a broad range of growth conditions, we do not observe ferromagnetism in undoped HfO{sub 2} films. On the other hand, we do observe room temperature ferromagnetism in dilutely Co-doped HfO{sub 2} films, but the origin of the same appears extrinsic (a Co rich surface layer) at least for the regime of growth conditions explored.},
doi = {10.1063/1.2190909},
journal = {Applied Physics Letters},
number = 14,
volume = 88,
place = {United States},
year = {Mon Apr 03 00:00:00 EDT 2006},
month = {Mon Apr 03 00:00:00 EDT 2006}
}