Magnetic Ionic liquids have paramagnetic properties by itself without the need of adding magnetic particles. These paramagnetic properties are set from the anion, the cation or both of them. Most common paramagnetic ionic liquids are those which contain [FeCl4]- ion

Ionic liquids are organic salts composed of heterocyclic organic cations and anions. The possible choices of a cation and an anion can result in the formation of practically unlimited Ionic liquids. The unique properties of these fluids include extremely low volatility, high thermal stability, wide temperature range of liquid phase, non-flammability, high chemical stability and high ionic conductivity. A key feature of Ionic liquids is that their cations, substituents, and anions can be varied virtually at will to change their chemical and physical properties. Thus the unique characteristic of these liquids is the ability to tailor-make their properties.