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Science 16 April 1999:
Vol. 284. no. 5413, pp. 470 - 473
DOI: 10.1126/science.284.5413.470
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Reports

Magnetization Directions of Individual Nanoparticles

S. A. Majetich, * Y. Jin

The magnetization directions of individual monodomain nanoparticles as small as 5 nanometers in diameter are determined using the Foucault method of Lorentz microscopy. A model is developed to explain the images and diffraction patterns of samarium cobalt nanoparticles as a function of the aperture shift direction. Thermally induced changes in the magnetization direction of superparamagnetic magnetite nanoparticles were observed but with a much slower rate than expected, due to surface anisotropy. When the time scale for magnetization reversal is much shorter than the data acquisition time, as in carbon-coated iron cobalt alloy nanoparticles, the images show an average of such thermally induced changes.

Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213-3890, USA.
*   To whom correspondence should be addressed. E-mail: sm70{at}andrew.cmu.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Monodisperse FePt Nanoparticles and Ferromagnetic FePt Nanocrystal Superlattices.
S. Sun, C. B. Murray, D. Weller, L. Folks, and A. Moser (2000)
Science 287, 1989-1992
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Science. ISSN 0036-8075 (print), 1095-9203 (online)