Hostname: page-component-745bb68f8f-5r2nc Total loading time: 0 Render date: 2025-01-15T07:15:32.751Z Has data issue: false hasContentIssue false
  • English
  • Français

Search for magnetism in Co and Fe-doped HfO2 thin films for potential spintronic applications

Published online by Cambridge University Press:  01 February 2011

M. S. R. Rao ,
Darshan C. Kundaliya ,
S. Dhar ,
C. A. Cardoso ,
A. Curtin ,
S. J. Welz ,
R. Erni ,
N. D. Browning ,
S. E. Lofland  and
C. J. Metting
...Show all authors
M. S. R. Rao
Affiliation:
Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742
Darshan C. Kundaliya
Affiliation:
Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742
S. Dhar
Affiliation:
Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742
C. A. Cardoso
Affiliation:
Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742
A. Curtin
Affiliation:
Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742
S. J. Welz
Affiliation:
Department of Chemical Engineering and Materials Science, University of California at Davis, California 95616 and
R. Erni
Affiliation:
Department of Chemical Engineering and Materials Science, University of California at Davis, California 95616 and
N. D. Browning
Affiliation:
Lawrence Berkeley National Laboratory, NCEM, One Cyclotron Road, Berkeley, California 94720
S. E. Lofland
Affiliation:
Department of Chemistry and Physics, Rowan University, Glassboro, New Jersey 08028–1701
C. J. Metting
Affiliation:
Department of Chemistry and Physics, Rowan University, Glassboro, New Jersey 08028–1701
S. B. Ogale
Affiliation:
Department of Materials Science, University of Maryland, College Park, Maryland 20742
T. Venkatesan
Affiliation:
Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, MD 20742, USA and
Get access

Extract

We studied the structural and magnetic properties of dilutely (5 mol%) doped 3d elements (Co and Fe) in PLD grown HfO2 high-k dielectric thin films. Monoclinic phase of HfO2 was stabilized by Co- and Fe- substitution at significantly low growth temperature (∼725 °C). No magnetic moment was observed in Co-doped HfO2 films. On the other hand, 5 mol% Fe-doped HfO2 films grown at different oxygen partial pressures (10-6 torr to 10 mtorr) showed interesting magnetization behavior with varying coercive field due to the segregation of Fe2O3 and Fe3O4 phases. Magnetic force microscopy (MFM) study revealed magnetic impurity phase segregation. Films grown at 1 × 10-4 torr of oxygen partial pressure (O2pp) showed oriented Fe3O4 impurity line (220) and the coercive field (Hc) ∼ 350 Oe. Films grown at higher oxygen partial pressure (1x10-2 torr) showed no impurities and magnetization was absent. Coercive field varied as a function of oxygen partial pressure. This property will be of great interest from the view point of magneto-optic applications.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 830: Symposium D – Materials and Processes for Nonvolatile Memories , 2004 , D6.13
Copyright
Copyright © Materials Research Society 2005

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1 Turquat, Ch., Leroux, Ch., Gloter, A., Serin, V., and Nihoul, G., Int. J. Inorg. Mater. 3, 1025 (2001).Google Scholar
2 Kobayashi, K., Yamaguchi, S., Higuchi, T., Shin, S., and Iguchi, Y., Solid State Ionics 135 Google Scholar
3 Foster, A.S., Lopez-Gejo, F., Shluger, A.I. and Nieminm, R.M.. Phys.Rev.B. 65, 174117 (2002)Google Scholar
4 Ohno, H., Science 281, 951 (1998).Google Scholar
5 Mauger, A., and Godart, C., Phys. Rep. 141, 51 (1986).Google Scholar
6 Oiwa, A., Mitsumori, Y., Moriya, R., Slupinski, T., and Munekata, H., Phys. Rev. Lett. 88, 137202 (2002)Google Scholar
7 Chambers, S.A., Thevuthasan, S., Farrow, R.F. C., Marks, R.F., Thiele, J.U., Folks, L., Samant, M.G., Kellock, A.J., Ruzycki, N., Ederer, D.L., and Diebold, U., Appl. Phys. Lett. 79, 3467 (2001).Google Scholar
8 Matsumoto, Y., Murakami, M., Shono, T., Hasegawa, T., Fukumura, T., Kawasaki, M., Ahmet, P., Chikyow, T., Koshihara, S.-Y., and Koinuma, H., Science 291, 854 (2001)Google Scholar
9 Shinde, S.R., Ogale, S.B., Das Sarma, S., Simpson, J.R., Drew, H.D., Lofland, S.E., Lanci, C., Gugan, J.P., Browning, N.D., Kulkarni, V.N., Higgins, J., Sharma, R.P., Greene, R.L., and Venkatesan, T., Phys. Rev. B 67, 115211 (2003).Google Scholar
10 Ogale, S.B., Choudhary, R. J., Buban, J.P., Lofland, S.E., Shinde, S.R., Kale, S.N., Kulkarni, V.N., Higgins, J., Lanci, C., Simpson, J.R., Browning, N.D., Das Sarma, S., Drew, H.D., Greene, R.L., and Venkatesan, T., Phys. Rev. Lett. 91, 077205 (2003).Google Scholar
11 Coey, J.M.D., Douvalis, A.P., Fitzgerald, C.B., and Venkatesan, M., Appl. Phys. Lett. 84, 1332 (2004).Google Scholar
12 Dimitrov, D.V., Hadjipanajis, G.C., Papaefthyminos, V. and Simopoulos, A.. IEEE Trans. Magn. 33, 4363 (1997)Google Scholar
13 DiVincenzo, D.P., J. Appl. Phys. 85, 4785 (1999).Google Scholar
14 Zhao, X., and Vanderbilt, D., Phys. Rev. B 65, 233106 (2002).43.Google Scholar
15 Kim, Y.J., Thevuthasan, S., Droubay, T., Lea, A.S., Wang, C.M., Shutthanandan, V., Chambers, S.A., Sears, R.P., Taylor, B. and Sinkovic, B.. Appl.Phys.Lett. 84 3531 (2004).Google Scholar
16 Schmidbauer, E. and Keller, R.. J. Magn.Magn.Mater. 152, 99 (1996).Google Scholar
17 Venkatesan, M., Fitzgerald, C.B. and Coey, J.M.D.. Nature. 430, 630 (2004).Google Scholar