Magnetic relaxation and superparamagnetism of non-interacting disordered CoPt nanoparticles
- 20 April 2006
- journal article
- research article
- Published by IOP Publishing in Journal of Physics D: Applied Physics
- Vol. 39 (9) , 1743-1748
- https://doi.org/10.1088/0022-3727/39/9/006
Abstract
Nanoparticles of a cobalt-platinum (CoPt) alloy near equiatomic composition. dispersed in a surfactant-polymer matrix, are synthesized using aqueous phase laser ablation. The magnetization dynamics of these particles is examined in the framework of the superparamagnetic blocking phenomenon based on a log-normal size distribution. Our analysts reveals, in accordance with electron microscopy results, two size distributions which peak at 1.3 and 5.9 nm. The magnetic anisotropy energy of these particles is 0.9 x 10(6) Jm(-3) and 0.1 x 10(6) Jm(-3), respectively.This publication has 40 references indexed in Scilit:
- Ion-beam-induced chemical-vapor deposition of FePt and CoPt particlesJournal of Applied Physics, 2005
- Memory Effects in an Interacting Magnetic Nanoparticle SystemPhysical Review Letters, 2003
- Functionalisation of magnetic nanoparticles for applications in biomedicineJournal of Physics D: Applied Physics, 2003
- The preparation of magnetic nanoparticles for applications in biomedicineJournal of Physics D: Applied Physics, 2003
- Applications of magnetic nanoparticles in biomedicineJournal of Physics D: Applied Physics, 2003
- Magnetic relaxation phenomena and inter-particle interactions in nanosized -Fe2O3systemsJournal of Physics: Condensed Matter, 2003
- Slow Dynamics for Spin-Glass-Like Phase of a Ferromagnetic Fine Particle SystemPhysical Review Letters, 1999
- Modelling magnetic relaxation phenomena in fine particles systems with a Preisach–Néel modelJournal of Magnetism and Magnetic Materials, 1998
- Aging in a Magnetic Particle SystemPhysical Review Letters, 1995
- Dipole interactions with random anisotropy in a frozen ferrofluidPhysical Review Letters, 1991