Laboratoire Léon Brillouin


Bât. 563 CEA Saclay

91191 Gif sur Yvette Cedex


Nanomagnetism, spintronic and multiferroic materials


Magnetic domain in a CoPt thin layer.

This research topic focuses on the development and study of:

  • magnetic materials or multiferroic oxides (ferroelectricity associated with magnetism)*
  • the magnetization dynamics in hybrid nanostructures and its coupling to the spin currents (spintronics)
  • development of ultra-sensitive magnetic sensor
  • and the associated modeling.

Such studies use many techniques mastered within IRAMIS: thin film growth (in particular oxides), magnetic transport measurements, (polarized) neutron scattering, ... The characterization of magnetic sensors is performed in a "ultra low magnetic noise laboratory" necessary to the development of multiple applications: non-destructive testing, security, speed sensors, current sensors ....

The "Nanomagnetism and Oxides Laboratory" (LNO) within SPEC has its activity fully focused on this topic.


Multiferroic materials are multifunctional materials having simultaneously several "ferroic" properties: ferromagnetism, ferroelectricity and / or ferro-elasticity. Their development in thin layers allows to design functional devices, where their coupled properties can be used.



26-09-2005 (480)

Transport properties of ferromagnetic atomic contacts
G. Autès, C. Barreteau, M.C. Desjonquères, D. Spanjaard
Spin electronics is an emerging science which aims at using the spin of the conduction electrons in electronic devices. In a near future, the fundamental mechanisms of spin transport will be affected by some physical limits linked to a further size reduction towards the nanometer scale. It is thus ... More »
Magnetocardiography with GMR (giant magnetoresistance) sensors
Measurement of the cardiac electrical activity allows following the heart dynamics. Usually measured with electrodes during an electrocardiogram (ECG), this activity can also be studied by monitoring the magnetic component, induced by the circulation of the heart electric currents. This is ... More »
Multiferroic compounds for more efficient and smaller digital memories
Making still smaller and less power consuming digital memories for mobile electronics? Scientists from CNRS and University Paris Sud XI (Laboratory of Solid State Physics, CNRS / Univ. Paris-Sud 11 and Institut Néel) and CEA-IRAMIS come to demonstrate the feasibility, thanks to ... More »
Coexistence of ferroelectricity and magnetism in the multiferroic compound BiFeO3
Delphine Lebeugle, Dorothée Colson, Anne Forget, Michel Viret (IRAMIS/SPEC CEA-Saclay) Arsen Goukassov, Alexandre Bataille (IRAMIS/LLB CEA-Saclay) Magnetic materials are heavily used in the dynamic storage of information (hard disk drive, head for reading). For these applications, they are ... More »
Reduction of the damping induced by nonlinear effects
G. de Loubens, V.V. Naletov and O. Klein
By measuring simultaneously Mz (the component parallel to the effective field direction) and absorption power, when ferromagnets are excited by microwave fields at high power levels, we found a diminution of the damping with increasing power. These changes are interpreted as reflecting the ... More »
Spin polarized transport in artificial structures. Iron and aluminium oxides epitaxial growth
DSM/DRECAM/SPCSI - Oxides group
Spin electronics is a new field of research which associates two domains of physics: magnetism and electronics. In the last decade, effects related to spin dependent transport like giant magnetoresistance (GMR) and tunnelling magnetoresistance (TMR) in magnetic heterostructures have stimulated a ... More »
Superconducting-magnetoresistive sensor for very low field measurements
Measurements of very weak field (down to the femtotesla range) have been mainly addressed by low-Tc SQUIDS. We have proposed in 2004 the principle of a new sensor, based on spin-electronics, to offer extremely good sensitivity for measurements of magnetic fields over a wide range of frequency (dc ... More »


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