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Electromagnetic Properties of Superparamagnetic Nanocomposites by C Desmarest; P Gadenne; M Noguès; J Sztern; C Naud; N Bontemps; S Djordjevic; M Gadenne is a Physics and Astronomy article available to read on EtoBox.

What is Electromagnetic Properties of Superparamagnetic Nanocomposites about?

We report here new experimental results on superparamagnetic nanocomposites. We compare experimental transmission measurements with calculations based on the Onsager local "eld, taking into account the permanent magnetic moment of the particles. Optical measurements are performed on a Fourier transform spectrometer in the far infrared range, and on a microwave setup. Usually, superparamagnetic relaxation is understood by comparing the relaxation time of the magnetic moment of the particle with the measuring time . According to NeH el's model is temperature dependent. In our case, is given by the electromagnetic wave period. As this experimental technique has been proved to be relevant to investigate superparamagnetism relaxation, we check it with two kinds of nanocomposites: Ni (ferromagnetic) embedded in alumina or aluminum nitride matrix and -Fe O particles (ferrimagnetic) in a polymer. The dominant anisotropy is magnetocrystalline for Ni and shape and/or surface for -Fe O . This di!erence leads to di!erent transmission behaviors while changing sample temperature from 5 to 300 K. The magnetocrystalline anisotropy shows up temperature dependence while the shape or surface anisotro

Who reads Electromagnetic Properties of Superparamagnetic Nanocomposites?

Author

C Desmarest; P Gadenne; M Noguès; J Sztern; C Naud; N Bontemps; S Djordjevic; M Gadenne

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0921-4526)

Published

2000

Language

EN

Field

Physics and Astronomy (Physical Sciences)