Low-Temperature Magnetic Properties, of Nanometric Fe-Based Particles |
| B. David, O. Schneeweiss
Intitute of Physics of Materials, AS CR,Žižkova 22, 61662 Brno, Czech Republic E. Šantavá Institute of Physics, AS CR, Na Slovance 2, 18221 Praha 8, Czech Republic R. Alexandrescu and I. Morjan National Institute for Laser, Plasma and Radiation Physics, P.O. Box MG-36, 76900 Bucharest, Romania |
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| Received: 9 07 2007; |
| Fe-based nanoparticles were prepared by laser-driven pyrolysis. The as-synthesised powder consists of α-Fe and Fe3O4/γ-Fe2O3 nanoparticles embedded in a pyrolytic carbon matrix. The crystallite size of 1.8 nm for α-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(TB) 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. |
| DOI: 10.12693/APhysPolA.113.561 PACS numbers: 81.16.Mk, 82.30.Lp, 75.50.Bb, 75.75.+a, 61.05.Qr |