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: Superconducting properties of nanostructures superconductor/ferromagnet”,


Author: Andrei Prepeliţă
Degree:doctor of physics and mathematics
Speciality: 01.04.07 - Condensed matter physics
Year:2006
Scientific adviser: Anatolie Sidorenko
doctor habilitat, professor, Institute of the Electronic Engineering and Nanotechnologies
Institution:

Status

The thesis was presented on the 18 September, 2006
Approved by NCAA on the 21 December, 2006

Abstract

Adobe PDF document – 0.31 Mb / in romanian
Adobe PDF document – 0.33 Mb / in russian

Thesis

CZU 537.312.62

Adobe PDF document 1.83 Mb / in russian
118 pages

Keywords

superconductor, fin layers, critical temperature, oscillations, LOFF-state, spintronics

Summary

An original vacuum technology for reliable and reproducible preparation of high quality nanostructures “superconductor/ferromagnet” (S/F) using magnetron sputtering is developed.

Superconducting properties of Nb/Ni bilayers prepared by on atomic smooth glass subtrates are investigated. The quality of the films was characterized by small-angle X-ray diffraction analysis(XRD Θ-2Θ). The thickness of the layers was determined by the Rutherford backscattering spectrometry (RBS). For specimens with constant Nb layer thickness we observed distinct oscillations of the superconducting critical temperature upon increasing the thickness of the Ni layer. The results are interpreted in terms of Fulde-Ferrell-Larkin-Ovchinnikov (LOFF) like inhomogeneous superconducting pairing in the ferromagnetic Ni Layer.

The obtained results can be used for superconducting electronics and spintronics.

The thesis is written in Russian