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Remarks About the Magnetic Characterization of Magnetite Nanopowders

A study on the possible corrections of the measured magnetization curves for magnetite (Fe3O4) nanoparticles is presented. The same nanopowder was measured using various sample shapes (cylinders, thin films) allowed by the VSM holders, which impose a specific packing fraction, and under different orientations of the applied magnetic field. Demagnetizing factors and effective field approaches are tried, the results showing that the macroscopic correction does not completely solve the dependence of the measured curves on the sample structure, orientation and shape.

Author(s):

Valentin IONITA    
Univ. POLITEHNICA of Bucharest
Romania

Emil CAZACU    
Univ. POLITEHNICA of Bucharest
Romania

Lucian PETRESCU    
Univ. POLITEHNICA of Bucharest
Romania