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Fabrication and Study of magnetic and transport properties of GdCo thin films, GdCo-based multilayers and Fe/Cr multilayers

Abstract : This joint thesis between Université Joseph Fourier in Grenoble and Vietnam National University in Hanoi deals with the study of the magnetic and spin transport properties of GdCo based structures and Fe/Cr multilayers. GdCo is a ferrimagnetic alloy, the composition of which can be chosen to get compensation, i.e. zero net magnetisation, at a chosen compensation temperature, below Curie temperature. Films were deposited using the sputtering technique. They are amorphous with a growth-induced out-of-plane anisotropy. Close to the compensation temperature the spontaneous magnetisation is perpendicular, and polar Kerr imaging and extraordinary Hall effect measurements were widely used to study the films as a function of temperature (4-300 K) and field (0-6 Tesla). An in-plane composition gradient could be induced and led to the study of a compensation wall i.e. a zero net magnetisation wall. The Gd and Co contributions to the Hall effect have been determined. Close to compensation, high field extraordinary Hall effect measurements gave access to the spin flop regime. GdCo/Cu/NiFe multilayers with perpendicular anisotropy GdCo and in-plane NiFe show giant magnetoresistance (GMR), the value of which does not depend on the angle between the magnetisation in each layer.
The study about Fe/Cr GMR multilayers deals with the interface contribution to the GMR mechanism. Varying the Fe thickness and annealing the samples allows to discuss the interface contribution to the GMR effect.
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Theses
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https://tel.archives-ouvertes.fr/tel-00406637
Contributor : Nguyen Thanh Nam <>
Submitted on : Friday, July 24, 2009 - 11:44:22 AM
Last modification on : Thursday, November 19, 2020 - 1:00:33 PM
Long-term archiving on: : Tuesday, June 15, 2010 - 7:19:36 PM

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  • HAL Id : tel-00406637, version 1

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Citation

Nguyen Thanh Nam. Fabrication and Study of magnetic and transport properties of GdCo thin films, GdCo-based multilayers and Fe/Cr multilayers. Physics [physics]. Université Joseph-Fourier - Grenoble I, 2007. English. ⟨tel-00406637⟩

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