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Applied Physics Letters / Volume 96 / Issue 22 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 96, 222506 (2010); http://dx.doi.org/10.1063/1.3441411 (3 pages)

Determining magnetic nanoparticle size distributions from thermomagnetic measurements

R. S. DiPietro1, H. G. Johnson1, S. P. Bennett2, T. J. Nummy1, L. H. Lewis3, and D. Heiman1

1Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA
2Department of Mechanical Engineering, Northeastern University, Boston, Massachusetts 02115, USA
3Department of Chemical Engineering, Northeastern University, Boston, Massachusetts 02115, USA

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(Received 3 February 2010; accepted 9 May 2010; published online 3 June 2010)

Thermomagnetic measurements are used to obtain the size distribution and anisotropy of magnetic nanoparticles. An analytical transformation method is described which utilizes temperature-dependent zero-field cooling magnetization data to provide a quantitative measurement of the average diameter and relative abundance of superparamagnetic nanoparticles. Applying this method to self-assembled MnAs nanoparticles in MnAs–GaAs composite films reveals a log-normal size distribution and reduced anisotropy for nanoparticles compared to bulk materials. This analytical technique holds promise for rapid assessment of the size distribution of an ensemble of superparamagnetic nanoparticles.

© 2010 American Institute of Physics

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    Appl. Phys. Lett. 98, 216102 (2011)APPLAB000098000021216102000001
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KEYWORDS and PACS

Keywords

gallium arsenide, III-V semiconductors, magnetic anisotropy, magnetic moments, magnetic particles, manganese compounds, nanocomposites, nanofabrication, nanoparticles, superparamagnetism

PACS

  • 61.46.Df

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

  • 75.30.Gw

    Magnetic anisotropy

  • 75.20.-g

    Diamagnetism, paramagnetism, and superparamagnetism

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3441411

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

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

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