Abstract
Composite systems are defined as those with two or more ferromagnetic or ferrimagnetic phases; sometimes they also contain an antiferromagnet. The number of possibilities are large; examples of contemporary interest include crystalline-amorphous components, soft and hard mixtures, multilayers and core-surface nanoparticles. Their common feature is an interface across which the magnetic interactions take place. These involve at least one and usually more of the following: magnetostatic dipole-dipole, isotropic exchange or superexchange, anisotropic and magnetoelastic interactions. The details depend on whether a phase is an electrical conductor, an insulator or one with mixed valencies as well as on the overall microstructure. Several examples, based mainly on Manitoba research, are described. Clearly, composite magnetic systems offer a plethora of challenges to today’s magneticians.
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