AC Magnetic Susceptibility Study in Co/Au Nanoparticles

Pavol Hrubovčák; Adriana Zelenakova; Vladimir Zelenak; Jana Michalíková

doi:10.4028/www.scientific.net/SSP.233-234.497

Paper Titles

Microwave Magnetic Induction Structure of the Surface Spin Wave in Ferrite Film
p.476

Hypersound Excitation in the Ferrite Plate by Impulse Magnetization Reversal
p.480

Concentration Dependences of Exchange Fields in Composite and Multilayer Thin Films
p.485

Study of the Torque Acting on the Magnetization during 90° Pulsed Reversal Process in Ferrite-Garnet Films with In-Plane Anisotropy
p.490

AC Magnetic Susceptibility Study in Co/Au Nanoparticles
p.497

Anisotropic Magnetoresistance and Weak Localization in Granular System Ni-MgO
p.501

Peculiarities of the Interface Forming in the “Nanocomposite-Bismuth Telluride” Multilayer System
p.505

Room Temperature Instability of Exchange Anisotropy in FeMn/FeCo System
p.509

Surface Modified Ni Nanoparticles Produced by the Electrical Explosion of Wire
p.513

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AC Magnetic Susceptibility Study in Co/Au Nanoparticles

Abstract:

In this work we report the study of magnetic relaxation process presented in the bimetallic Co/Au nanoparticles prepared utilizing the reverse micelle method. Structural analysis of the system using synchrotron X-ray diffraction and transmission electron microscopy documented individual nanocrystalline particles of average size about 7 nm. Magnetic properties of the particles were examined by ac magnetic susceptibility measurements at temperature range 2 – 300 K at different frequencies of magnetic field. The relaxation process was revealed at temperature about 6 K. Application of several theoretical models on experimental data of magnetic susceptibility confirmed strong inter-particle interactions and novel superspin glass state in the nanoparticle system at low temperatures.