Objective
We have investigated perpendicular transport properties in three types of metallic and metal/insulator magnetic multilayered systems : i) Antiferromagnetically coupled metallic multilayers, ii) Magnetic tunnel junctions, and iii) A new magnetic field sensor named "spin-valve transistor". The feasability of using perpendicular transport in making field sensors has been assessed. Among the various systems investigated, the most promising for applications are the magnetic tunnel junctions and the spin-valve transistor. At the end of the project, macroscopic and microscopic magnetic tunnel junctions showing MR amplitude of more than 15% can be reproducibly prepared. Concerning the spin-valve transistor, changes in collector current of more than 300% by application of a magnetic field has been observed. A technique of direct bonding under ultrahigh vacuum has been developed. This allows to prepare spin-valve transistors with high gain. These transistors operate at room temperature. Regarding perpendicular transport in metallic multilayers, very interesting results have been obtained from a fundamental point of view, especially concerning the angular variation of the CPP-GMR. The CPP transport properties of pillar multilayered structures have been investigated to assess the potentiality of these systems for making magnetic field sensors. Unfortunately, a persistent difficulty has been encountered with the too large resistance of the interconnecting leads. This in-series lead-resistance significantly reduces the output magnetoresistance of these devices. As a result, the SNR of these pillar structures is lower than for conventional CIP giant magnetoresistance devices.
In 1988, the discovery of giant magnetoresistance (GMR) in (Fe 10Angstroms/Cr 9Angstroms)20 multilayers launched a considerable activity on the in-plane transport properties of magnetic multilayers. In contrast, the transport properties in the direction perpendicular to the interfaces which constitute the aim of the present project, have remained almost unexplored because of great technological difficulties. The motivation of this work is that much more dramatic magnetic effect on the transport properties are expected in the perpendicular versus in-plane geometry such as for instance GMR one to two orders of magnitude larger than observed so far with in-plane current.
This project associates five group (3 from research centres, 1 from university, 1 from industry) with complementary experience in different aspects of structural magnetic and transport properties of multilayers. The interest in this project is both for fundamental research and applications in magnetic flux sensors.
The project focuses on two types of systems : metallic multilayers consisting of an alternation of magnetic and non-magnetic metallic layers and multilayers comprising of ferromagnetic layers with insulating spacers.
For metallic multilayers, we plan to characterise the perpendicular GMR of various (Fe/Cr) type multilayers and (NiFe/Cu/NiFe/FeMn) type spin-valve sandwiches and search for extremely large GMR in these systems. In a technology for elaboration of magnetoresistive devices used as magnetic flux sensors based on the perpendicular GMR. For multilayers with insulating barriers we plan to acquire the ability to grow good insulating junctions between ferromagnetic films (R = +/- 1k * for area * 0.1mm2) and explore the possibility of GMR in these type of multilayers.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- engineering and technology electrical engineering, electronic engineering, information engineering electronic engineering sensors
- natural sciences mathematics pure mathematics geometry
You need to log in or register to use this function
We are sorry... an unexpected error occurred during execution.
You need to be authenticated. Your session might have expired.
Thank you for your feedback. You will soon receive an email to confirm the submission. If you have selected to be notified about the reporting status, you will also be contacted when the reporting status will change.
Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Call for proposal
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Data not available
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Funding Scheme
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
38041 Grenoble
France
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.