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Colloids made from ferrite nanoparticles are a good example of how the properties of materials change when scaled down to the nanometre scale: the continuous spectrum of magnetic spin wave excitations breaks up to a set of discrete absorption lines. In order to exploit this phenomenon, the chemical composition of the ferrite as well as the preparation method for the suspensions are essential: in nickel zinc ferrites, the magnetic anisotropy field and the life time of magnetic resonance states can be fine tuned by the zinc content to achieve optimal microwave absorption. This makes such colloids interesting for high-power microwave applications, such as bond/disbond-on-command, that are difficult to obtain with polycrystalline materials.

Nanoscaled Nickel-Zinc-Iron Oxides of Spinell Type as Soft Magnetic Colloids and their Ferromagnetic Resonance Spectrum