Magnetic materials are well known for applications e.g. in data storage, but ferroelectric materials have important applications as well, such as being used for sensors. For a material combining both magnetism and ferroelectricity a number of additional applications may be envisaged. Unfortunately, "conventional" ferroelectricity and magnetism seem to be diametrically opposed, and in the rare instances when they occur simultaneously the coupling between magnetic and electric order parameters is weak. Recently, ferroelectricity originating from certain spiral magnetic structures has been observed and described. These materials exhibit a large magneto-electric coupling, but due to the key role of the Dzyaloshinskii-Moriya interaction the ferroelectric polarization is small.

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1. Single crystals of pure and substituted MgB₂: crystal growth and physical properties