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Journal of Applied Physics / Volume 109 / Issue 7 / PROCEEDINGS OF THE 55TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS / Magnetic Nanoparticles

J. Appl. Phys. 109, 07B518 (2011); http://dx.doi.org/10.1063/1.3556953 (3 pages)

Magnetic properties of NiO and (Ni, Zn)O nanoclusters

M. A. Peck1,2, Y. Huh3,2, R. Skomski2,4, R. Zhang2,4, P. Kharel2,4, M. D. Allison3,2, D. J. Sellmyer2,4, and M. A. Langell1,2

1Department of Chemistry, University of Nebraska, Lincoln, Nebraska 68588, USA
2Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588, USA
3Department of Physics, South Dakota State University, Brookings, South Dakota 57007, USA
4Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588, USA

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(Received 24 September 2010; accepted 30 November 2010; published online 25 March 2011)

Rock-salt NiO and Ni0.7Zn0.3O nanoparticles were investigated by x-ray diffraction, atomic-force microscopy, and magnetic measurements. Nanoparticle diameters varied from 8 to 30 nm depending on reaction conditions. There are two main magnetization contributions, the field-induced spin canting of the antiferromagnetic sublattices and the magnetization rotation caused by uncompensated spins interacting with the magnetic field. The former is a bulk effect, modified by the presence of Zn, whereas the latter is a nanoscale effect that increases with decreasing particle size. The relative contributions of the two effects depend on particle size with a critical size of about 18 nm resulting in bulklike behavior.

© 2011 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. SAMPLE PREPARATION AND CHARACTERIZATION
  3. MAGNETIC PROPERTIES
  4. DISCUSSION AND CONCLUSIONS

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KEYWORDS and PACS

Keywords

antiferromagnetic materials, atomic force microscopy, magnetisation, molecular clusters, nanofabrication, nanoparticles, nickel compounds, particle size, X-ray diffraction, zinc compounds

PACS

  • 75.75.-c

    Magnetic properties of nanostructures

  • 81.16.-c

    Methods of micro- and nanofabrication and processing

  • 61.46.Df

    Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)

  • 75.60.Ej

    Magnetization curves, hysteresis, Barkhausen and related effects

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3556953

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    W. L. Roth, Phys. Rev. 110, 1333 (1958).

    S. A. Makhlouf, F. T. Parker, F. E. Spada, and A. E. Berkowitz, J. Appl. Phys. 81, 5561 (1997)JAPIAU000081000008005561000001.

    J. B. Tracy, D. N. Weiss, D. P. Dinega, and M. G. Bawendi, Phys. Rev. B 72, 064404 (2005).

    C. T. Meneses, J. G. S. Duque, E. de Biasi, W. C. Nunes, S. K. Sharma, and M. Knobel, J. Appl. Phys. 108, 013909 (2010)JAPIAU000108000001013909000001.


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