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Laboratoire Léon Brillouin
Bât. 563 CEA Saclay
91191 Gif sur Yvette Cedex
Nanomagnetism, spintronic and multiferroic materials


Magnetic domain in a CoPt thin layer.

The nanomagnetism and spintronic activity of the Department is gathered in an entity Capmag made up of groups belonging to various teams. The principal research topics of Capmag are: - Epitaxial growth of magnetic oxides - Spin-polarized transport in artificial structures - Dynamics and high frequency noise in small magnetic structures - Spin-polarized transport through an atom or a nanoconstriction - Spin-polarized transport in carbon nanotubes - Neutron reflectivity and surface diffraction on magnetic thin films - Spin-polarized transport and precession in unidimensional conductors - Neutron scattering at small angles on polarized systems - Magnetic microscopy and mechanical detection of ferromagnetic resonance - Spin injection in semiconductors - Inversion of magnetization per spin injection - Polarized transport theory in nanostructures.

Multiferroic materials are multifunctional materials because they possess simultaneously several "ferroic" properties: ferromagnetism, ferroelectricity and / or ferro-elasticity. Their development in thin layers allows for functional objects, where coupled properties can be exploited.



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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