Laboratoire de Physique et Chimie de Nano-Objets
135 avenue de Rangueil, 31077 TOULOUSE CEDEX 4 - FRANCE
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Thematics of research
Magnetism of nano-objects
Our activities are focused on the study of size reduction effects on magnetic properties, such as spin and orbital contributions, anisotropy, and ordering temperature by measurements of magnetization, ferromagnetic resonance, XMCD, Mössbauer. These properties are strongly correlated to the crystalline structure, and the shape and chemistry of surface. We study transition metals (Mn, Fe, Co, Ni) and bimetallic systems 3d/3d (FeNi, FeCo), 3d/4d (CoRh, FeRh, …), 3d/5d (CoPt). In addition to (...)
Magnetotransport properties
Electronic transport through 3D, 2D, 1D organized arrays or single nano-object are studied. Our aim is to understand conduction mechanisms, mainly effects linked to Coulomb blockage, magneto-resistance, and influence of organic barriers. The system which has been the most studied in the laboratory are super-lattices of FeCo nanoparticles, synthesized by Céline Desvaux (LCC, Toulouse). They display typical Coulomb blockade properties, and surprisingly high values of magnetoresistance (up to (...)
Biomedical applications
Nanoparticles may have applications in the framework of the cancer treatment. For that purpose, targeted nanoparticles are injected into a patient. Once these nanoparticles fixed on the tumor, the patient is put into a high-frequency magnetic field (typically 100 kHz and 10 mT), which is safe for him, but induces a heating of the nanoparticles. This treatment improves the efficiency of chemiotherapy. We study in our team the heating properties of iFe and FeCo nanoparticles synthesized by (...)
Carbon Nanotube Electromechanical Resonators: Towards Unique Magnetic Nanoparticle Measurements
The project we propose, aims to develop and to optimize carbon nanotube electromechanical resonators for ultra sensitive magnetic measurements. With this new and original approach we want to directly measure the hysteresis magnetic loop on a broad temperature and magnetic field range of one chemically synthesized nano-object as nanoparticles with very small size (d 1nm) and small magnetization or molecular magnets. This measurement technique should allow us to better understand the (...)
