Objective
The emerging science of < spin electronics > offers a new exciting way of meeting the need for high-speed sensitive detection of densely stored data. An example of a new generation of electronic devices is the GMR read-head, now commercially available. In common with all electronic systems, noise is expected to limit the performance of this technology, but has not been investigated so far. In magnetic materials noise can be generated by current-related events and magnetic fluctuations whose respective weights strongly depend on the nature of the magnetic systems (e.g. all-metal spin devices, tunnel spin valves or oxide-based spin systems). In addition, the geometry and shape of the devices can greatly influence noise levels because magnetic fluctuations can be of a different nature in very small elements while electronic transport is modified by ballistic effects. The aim of this project is to quantify and understand the different sources of noise in various spin systems (model and commercial) and propose ways of optimising spin devices.
OBJECTIVES
We propose to quantify and understand noise sources of magnetic and electronic origins in spin electronic devices and squids used as field sensors by addressing the following issues:
- Characterise and understand electronic noise in small magnetic structures including GMR and TMR sensors, patterned perovkites oxide films and multi-layers with high-Tc superconductors and manganites, in a spectral range between DC and several hundred MHz;
- Modelling of the noise. Separation of the different sources electrical noise, magnetic domain wall fluctuations. Include the effect of the temperature (phonons, spin waves);
- Development of high-Tc squids systems optimised for magneto-encephalography;
- Fabrication of high-Tc microsquids for microscopic magnetic imaging;
- Study of magnetic fluctuations with high-Tc microsquids in small magnetic structures. Correlate magnetic fluctuations and electronic noise;
- Optimise the design of low noise GMR and TMR sensors for high density read heads;
- Assess the market potential for spin electronic based devices.
DESCRIPTION OF WORK
In order to achieve the expected objectives, the work will proceed in four steps detailed below: The first step is to study in detail electronic noise in different types of magnetic sensors following the programme below:
Characterise and understand electronic noise in small metallic magnetic structures. Characterise and understand electronic noise in patterned perovskites oxide films and multilayers including high-Tc superconductors and manganites. Characterise and understand electronic noise in GMR ad TMR sensors Modelling of the noise. Separation of the different sources: electrical noise, magnetic domain wall fluctuations. Effect of the temperature (phonons, spin waves).
The second step is to develop High-Tc squids down to micron size for various applications in the following stages : Development of high-Tc squids optimised for magneto-encephalography. Fabrication of high-Tc microsquids for microscopic magnetic imaging and noise mapping. Noise mapping of mesoscale magnetic elements and devices.
The third step is to optimise the design of low noise GMR and TMR sensors for high density reading as detailed: Comprehensive study of the effect of size, shape and anisotropy on the noise figure in GMR and TMR sensors. to study the noise of a complete read head. propose a complete read head design for high density storage.
The fourth step is to assess the market potential for spin electronic based devices.
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.
- natural sciences physical sciences atomic physics
- natural sciences physical sciences electromagnetism and electronics spintronics
- engineering and technology electrical engineering, electronic engineering, information engineering electronic engineering sensors
- natural sciences mathematics pure mathematics geometry
- natural sciences physical sciences electromagnetism and electronics superconductivity
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Coordinator
75752 PARIS CEDEX 15
France
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