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Détection de radiofréquence par des composants
Magnéto Résistifs

Abstract : This thesis is about the behaviour of the Giant Magneto Resistance effect in a micrometric spin valve sensor fed with a hyper frequency magnetic field and a hyper frequency voltage. This lead us to develop an original technique based upon using the sensor as an in situ demodulator. The study of the magnetization dynamic of the spin valve with micro antennas allowed us to determine the rules for the ferromagnetic resonance of the free layer of the sensor and to emphasize the role of the dipolar coupling and the electron scattering on the relaxation process. These results allowed us to model the GMR effect when a hyper frequency magnetic field is applied, showing the very good sensitivity of the sensor to this kind of excitation. Moreover, the magnetization dynamic of the hard layer have been has been detected from the profile in frequency of the GMR effect. At last we obtained a preliminary result showing the decrease of the GMR effect when the frequency of the applied voltage is higher than the ferromagnetic resonance frequency of the free layer.
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Theses
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https://tel.archives-ouvertes.fr/tel-00135915
Contributor : Marc Gingold <>
Submitted on : Friday, March 9, 2007 - 3:37:28 PM
Last modification on : Monday, February 10, 2020 - 6:12:21 PM
Document(s) archivé(s) le : Wednesday, April 7, 2010 - 1:30:47 AM

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  • HAL Id : tel-00135915, version 1

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Nicolas Biziere. Détection de radiofréquence par des composants
Magnéto Résistifs. Matière Condensée [cond-mat]. Université Paris Sud - Paris XI, 2007. Français. ⟨tel-00135915⟩

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