Surface-core intraparticle interactions in nanoparticles

R.D. ZYSLER

Buenos Aires

Congreso; Frontiers of Condensed Matter II: Magnetism, Magnetic Materials and their applications; 2004

The surface/volume ratio is large in nanoparticles (e.g. for ~3 nm nanoparticles, approximately 70% of atoms are in the surface), and consequently surface effects play an important role in determining their magnetic bahaviour. In amorphous single domains the shape anisotropy affects the core magnetic moment and the surface anisotropy is originated only by the spin-orbit coupling of each surface ion. As is expected, all surface effects be enhanced (e.g., an enlargement of the disordered shell) and amorphous nanoparticles give us a chance to study under a different point of view.  Magnetization measurements in ~3nm amorphous nanoparticles are present where surface effects and intra-particle interactions are significant. Interparticle interaction effects on the surface magnetic order are also discussed.