Skip to Main content Skip to Navigation
Theses

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.
Complete list of metadata

Cited literature [157 references]  Display  Hide  Download

https://hal.univ-lorraine.fr/tel-01746237
Contributor : Thèses Ul Connect in order to contact the contributor
Submitted on : Thursday, March 29, 2018 - 10:28:30 AM
Last modification on : Saturday, October 16, 2021 - 11:20:09 AM
Long-term archiving on: : Thursday, September 13, 2018 - 11:41:05 AM

File

SCD_T_2011_0086_PETRISOR.pdf
Files produced by the author(s)

Identifiers

  • HAL Id : tel-01746237, version 1

Citation

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⟩

Share

Metrics

Record views

97

Files downloads

330