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In-KF15-012
Investigating the structure, chemical composition and
magnetic interactions in assemblies of ferromagnetic nanoobjects by Ferromagnetic Nuclear Resonance
Christian MENY, Yooleemi SHIN
Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR
7504 CNRS- University of Strasbourg, 23, rue du Loess, 67034 Strasbourg,
France
Department of Physics, CNRS-Ewha International Research Center, Ewha
Womans University, Seoul 120-750, South Korea
Assemblies of nanoparticles are widely studied in many research fields such as spintronics,
medicine or catalysis… Their properties will depend on the size, shape, crystallographic structure
and chemical composition of the nano-particles. In addition, assemblies of nanoparticles often
show wide size distributions making the interpretation of their properties even more complicated.
Indeed the structure and the chemical order of the particles might change with the size of the
particles within the particles’ size distributions. In the first part of this presentation we show that
new methods in Ferromagnetic Nuclear Resonance (FNR, i.e. Nuclear Magnetic Resonance for
ferromagnets) allow mapping the structure and the chemical order of assemblies of nanoparticles
within their size distributions. In addition, when we consider ferromagnetic nano-objects that are
organized in closely packed assemblies, dipolar interactions will also strongly influence the
magnetic properties of the system. In the second part of the talk we show that Ferromagnetic
Nuclear Resonance can also provide insight into the dipolar interactions between nano-objects.
Indeed through the study of an assembly of closely packed nanowires we show that FNR allows a
direct measurement of the demagnetizing field resulting from the collective behavior of the
nanowires.
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