Time and temperature dependent magnetic viscosity experiments on Sr/Co nanoferrite particles

Author:

Maltoni Pierfrancesco1ORCID,Varvaro Gaspare2ORCID,Abdolrahimi Maryam2,Peddis Davide23ORCID,Mathieu Roland1ORCID

Affiliation:

1. Department of Materials Science and Engineering, Uppsala University 1 , Box 35, 751 03 Uppsala, Sweden

2. ISM-CNR, nM2-Lab 2 , Area della Ricerca Roma 1, Monterotondo Scalo (Roma) 00015, Italy

3. Department of Chemistry and Industrial Chemistry, University of Genova 3 , 16146 Genova, Italy

Abstract

Magnetic viscosity experiments have been performed in order to investigate the magnetization reversal in Sr nanoferrite particles (nanoscale SrFe12O19) and interacting Sr/Co nanoferrite particles (SrFe12O19–CoFe2O4 nanocomposites). The magnetic viscosity S = d M ( t ) / d l n ( t ), where M ( t ) is the magnetization as a function of time, has been collected. For Sr nanoferrite S shows a maximum close to the coercive field, reflecting the relation between S and the energy barrier distribution. We evidence that magnetic viscosity experiments on Sr nanoferrite and interacting Sr/Co nanoferrite particles provide reliable qualitative results for the different magnetic field sweep rate and saturating field H s a t considered. In addition, the activation volumes extracted from the magnetic viscosity experiments performed at different temperatures on Sr nanoferrite are quantitatively correlated to anisotropy changes.

Funder

Energimyndigheten

Vetenskapsrådet

Publisher

AIP Publishing

Subject

General Physics and Astronomy

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