Magnetic properties of FeCo nanoparticles encapsulated in carbon

0343287 - FZÚ 2011 RIV GB eng J - Journal Article
Maryško, Miroslav - Fajgar, Radek - Šubrt, Jan - Murafa, Nataliya - Knížek, Karel
Magnetic properties of FeCo nanoparticles encapsulated in carbon.
Journal of Physics: Conference Series. Roč. 200, č. 7 (2010), 072065/1-072065/5. ISSN 1742-6588. E-ISSN 1742-6596
R&D Projects: GA ČR GA203/07/0546
Institutional research plan: CEZ:AV0Z10100521; CEZ:AV0Z40720504; CEZ:AV0Z40320502
Keywords : magnetic nanoparticles
Subject RIV: BM - Solid Matter Physics ; Magnetism

The as-prepared and heat treated iron/cobalt nanoparticles with r=Co/Fe=0.08 and 1 were obtained by laser decomposition.At low temperatures all the materials are in a ferromagnetic blocked state..At higher temperatures the as-prepared materials exhibit superparamagnetic properties.In this case the nanoparticle size distribution deduced from the m(H) curves and from the susceptibilities was compared with the TEM data.The heat treated materials have larger magnetizations and a maximum 161 emu/g was achieved for the r=1 material treated at 900°C.For this material an anomalous form of the hysteresis loop was explained in terms of a superposition of single and multi-domain magnetizations.
Permanent Link: http://hdl.handle.net/11104/0185803