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Modulated magnetic structures for vortex pinning in high temperature superconductors

Abstract : The present thesis deals with the fabrication and study of hybrid, ferromagnetic/superconducting, interface systems. Magnetic mezoscopic systems, whose magnetic properties were modulated by the dimensionality (thickness and lateral size) of the systems was studied. Two types of structures were considered. The first consisted of perovskite-like epitaxial LaSrMnO thin films. We have demonstrated the direct correlation between oxygen incorporation in the LaSrMnO lattice and the evolution of its structural, magnetic and electric properties. A second class of magnetic materials that has been studied consisted of transition metals (Co) and alloys (Ni80Fe20). We have defined micronic objects from the as-deposited films, by means of optical lithography and ion beam etching. These structures were then integrated to form an interface with thin epitaxial high Tc superconducting films: YBaCuO. The ultimate goal of the above studies was the control of vortex dynamics within the superconducting layer by two mechanisms: the first, intrinsic, in which flux pinning is achieved by structural defects within the superconducting film, and a second one, extrinsic, correlated with influence of the magnetic field modulations created by the adjacent mezoscopic magnetic structure.
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Submitted on : Thursday, March 29, 2018 - 10:28:30 AM
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  • HAL Id : tel-01746237, version 1


Traian Petrisor. Modulated magnetic structures for vortex pinning in high temperature superconductors. Other [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2011. English. ⟨NNT : 2011NAN10086⟩. ⟨tel-01746237⟩



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