Low-Temperature Magnetic Properties of Nanometric Fe-Based Particles

doi:https://doi.org/10.12693/aphyspola.113.561

Open AccessArticle10.12693/aphyspola.113.561

Low-Temperature Magnetic Properties of Nanometric Fe-Based Particles

B. David,O. Schneeweiss,E. Šantavá,R. Alexandrescu,I. Morjan-2008-01-01-Acta Physica Polonica A

TL;DRAbstract

Fe-based nanoparticles were prepared by laser-driven pyrolysis. The assynthesised powder consists of -Fe and Fe 3 O 4 /-Fe 2 O 3 nanoparticles embedded in a pyrolytic carbon matrix. The crystallite size of 1.8 nm for -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-Mssbauer factor f was significantly higher at 4 K than at 293 K.

Chat with Paper

AI Agents for this Paper

Fe-based nanoparticles were prepared by laser-driven pyrolysis. The assynthesised powder consists of -Fe and Fe 3 O 4 /-Fe 2 O 3 nanoparticles embedded in a pyrolytic carbon matrix. The crystallite size of 1.8 nm for -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-Mssbauer factor f was significantly higher at 4 K than at 293 K.

Keywords

Materials scienceCondensed matter physicsPhysics

Chat

Click to start Chat