Solid state physics, surfaces and interfaces / Solid state physics, chemistry and nanosciences
Spin Injection and Transport in Hybrid Ferromagnetic/Organic semiconductor Heterostructures
In this thesis work, we plan to study the spin injection via ferromagnetic electrodes and transport through organic materials in the form of thin layers, small molecules or even a single molecule. In order to achieve this, two original devices will be investigated:
- Systems based on break junctions, which consist in breaking a suspended bridge of a few 100 nm in widthand micrometer in length covered with a thin layer of organic materials. These nanostructures are defined on Kapton substrates which can be bent in order to generate a large strain in the bridge leading to breakage. We have recently proved that the system can be scaled down to a small number of polymers (providing a very diluted layer of polymers is deposited) and even possibly to a single organic molecule.
- Ferrite-based magnetic tunnel junctions consisted by two ferromagnetic electrodes separated by an organic thin layer: AFe2O4/organique/(Co, Fe?). Ferrites (Fe3O4, CoFe2O4?) are very attractive oxides for the generation of a highly spin-polarized current at room temperature.
Concerning the organic layers, we will study semi-conducting (Alq3, pentacene, rubrene?) or insulating molecules. In the second case, non-functionalized molecules such as polymers (PMMA?) or short molecules with a functionalization at the termination will be investigated.
Institut rayonnement et matière de Saclay
Service de Physique et de Chimie des Surfaces et Interfaces
Laboratoire des Interfaces et Surfaces d'oxydes
Centre : Saclay
Starting date : 01/11/2012