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Low-Temperature Magnetic Properties of Nanometric Fe-Based Particles

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David B., Schneeweiss O., Šantavá E., Alexandrescu R., Morjan I.
Acta Physica Polonica A
|
2008
|
vol. 113
|
issue 1
561-564
EN
Fe-based nanoparticles were prepared by laser-driven pyrolysis. The as-synthesised powder consists ofα-Fe and Fe_3O_4/γ-Fe_2O_3 nanoparticles embedded in a pyrolytic carbon matrix. The crystallite size of 1.8 nm forα-Fe was calculated using the Scherrer formula. The as-synthesised nanopowder was superparamagnetic. The maximum of the zero-field cooling curve was observed at 32 K and the distribution of blocking temperatures g(T_B) peaked at 11 K. As a result of small particle sizes and the soft matrix, the Lamb-Mössbauer factor f was significantly higher at 4 K than at 293 K.
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