Exchange Interaction in the Co-SiO2 Nanocomposite Films

Abstract:

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The properties of Co-SiO2 nanogranular composite films, containing a Co volume fraction ranging from 0.3 to 0.8, have been characterized by means of magnetic measurements, NMR study, and ferromagnetic resonance. Thermal decrease of CoX(SiO2)100-X magnetization follows the T3/2 law and allows to estimate the exchange interaction constant A. With growing nominal Co content the transitions from granular to continuous structural state at 36% Co are registered by FMR measurements. The spectrum of standing spin-wave has been detected in the perpendicular experiment configuration for films with the Co content above 52 vol. %. It is found that the type of the dispersion relation of spin waves in Co-SiO2 composite films is affected by the exchange coupling fluctuations.

Info:

Periodical:

Solid State Phenomena (Volumes 168-169)

Main Theme:

Edited by:

V. Ustinov

Pages:

265-268

DOI:

10.4028/www.scientific.net/SSP.168-169.265

Citation:

E. A. Denisova et al., "Exchange Interaction in the Co-SiO2 Nanocomposite Films", Solid State Phenomena, Vols. 168-169, pp. 265-268, 2011

Online since:

December 2010

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Price:

$35.00

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