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Spectroscopie micro-onde d'une nanostructure métallique magnétique hybride : RFM-resonance ferromagnétique; MRFM-microscopie de force à
résonance magnétique; transfert de spin; électronique de

Abstract : The aim of this thesis is to understand the influence of a DC current flowing through a spin-valve device on its magnetization dynamics. An original spectrometer has been developed in order to measure the FMR signal of an individual nanostructure. Inspired by near field techniques, it is using a mechanical detection. The excitation spectrum of an individual Permalloy nano-disk has first been measured. This study has allowed us to quantitatively understand spectral modifications induced by finite-size effects. Then, hybrid systems made of metallic magnetic multilayers have been studied. In the measured samples, spin transfer effects have been observed though Oersted field effects are dominating. The experimental setup allowed us as well to study the relaxation term of a ferromagnetic spins system in the high power regime. Our results show that the damping decreases as linear effects appear.
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https://tel.archives-ouvertes.fr/tel-00118828
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Submitted on : Wednesday, December 6, 2006 - 3:46:24 PM
Last modification on : Monday, February 10, 2020 - 6:12:21 PM
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  • HAL Id : tel-00118828, version 1

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G. de Loubens. Spectroscopie micro-onde d'une nanostructure métallique magnétique hybride : RFM-resonance ferromagnétique; MRFM-microscopie de force à
résonance magnétique; transfert de spin; électronique de. Physique [physics]. Université Paris Sud - Paris XI, 2005. Français. ⟨tel-00118828⟩

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