| Issue |
Europhys. Lett.
Volume 60, Number 4, November 2002
|
|
|---|---|---|
| Page(s) | 573 - 579 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2002-00257-1 | |
| Published online | 01 November 2002 | |
Magnetic-field–induced spontaneous pattern formation in aerosol-particle deposits
FR 7.3 Technische Physik, Universität des
Saarlandes - 66041 Saarbrücken, Germany
Received:
21
January
2002
Accepted:
26
August
2002
Magnetic nanometer-sized crystallites dissolved in an aerosol have been condensed on a substrate in the presence of a homogeneous magnetic field. Dipolar interaction favours chain formation, which on further growth leads to the self-organized formation of nanoparticle chain arrays that spontaneously undergo structural instabilities. When a critical chain length is exceeded, spontaneous formation of regular patterns is observed, similar to the Rosensweig instability in ferrofluids. We present a phenomenological stability analysis enabling to predict the magnetic-field dependence of the modulation wavelength of the observed hexagonal patterns.
PACS: 61.46.+w – Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals / 75.75.+a – Magnetic properties of nanostructures / 05.65.+b – Self-organized systems
© EDP Sciences, 2002
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