Consequences of Magnetic Interaction Phenomena in Granular Systems

Abstract

Magnetic interactions in systems composed of nanoparticles in a matrix give rise to phenomena that are observable through magnetic and magnetotransport measurements. In this article, we present some basic concepts and review a useful technique for characterizing those systems, which represents a class of magnetization versus temperature measurement, ZFC-FC curves. Based on this tool we comment on some results on granular systems: diluted, interacting, and percolated superparamagnets. We also discuss how those magnetic features affect magnetotransport properties like giant magnetoresistance, tunneling magnetoresistance, and the giant Hall effect.