Magnetoelectric materials, in which an electric field induces a magnetisation that is linear in the applied field and vice versa, and the corresponding magnetoelectric effect have a longer history, shown in blue in the graph to the right . ( Note that while magnetoelectric materials are not necessarily multiferroic, all ferromagnetic ferroelectric multiferroics are magneto electric . ) The first known mention of magnetoelectricity is in the 1959 Edition of Landau & Lifshitz "'Electrodynamics of Continuous Media " which has the following comment at the end of the section on piezoelectricity : " Let us point out two more phenomena, which, in principle, could exist.
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