Low-Temperature Magnetic Properties of Nanometric Fe-Based Particles

• Authors: B. David , O. Schneeweiss , E. Šantavá , R. Alexandrescu , I. Morjan
• Languages of publication: EN

Abstracts

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.

Keywords

EN

81.16.Mk; 82.30.Lp; 75.50.Bb; 75.75.+a; 61.05.Qr

Discipline

• 61.05.Qr: Magnetic resonance techniques; Mössbauer spectroscopy (for structure determination only)
• 81.16.Mk: Laser-assisted deposition
• 82.30.Lp: Decomposition reactions (pyrolysis, dissociation, and fragmentation)
• 75.50.Bb: Fe and its alloys

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2008
• Volume: 113
• Issue: 1
• Pages: 561-564

Dates

published

2008-01

received

2007-07-09

Contributors

author

B. David

• Intitute of Physics of Materials, AS CR,, Žižkova 22, 61662 Brno, Czech Republic

author

O. Schneeweiss

• Intitute of Physics of Materials, AS CR,, Žižkova 22, 61662 Brno, Czech Republic

author

E. Šantavá

• Institute of Physics, AS CR, Na Slovance 2, 18221 Praha 8, Czech Republic

author

R. Alexandrescu

• National Institute for Laser, Plasma and Radiation Physics, P.O. Box MG-36, 76900 Bucharest, Romania

author

I. Morjan

• National Institute for Laser, Plasma and Radiation Physics, P.O. Box MG-36, 76900 Bucharest, Romania

References

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Identifiers

DOI

10.12693/APhysPolA.113.561