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Apart from being so far the only known binary multiferroic compound, CuO hasa much higher transition temperature into the multiferroic state, 230 K, thanany other known material in which the electric polarization is induced byspontaneous magnetic order, typically lower than 100 K. Although themagnetically induced ferroelectricity of CuO is firmly established, nomagnetoelectric effect has been observed so far as direct crosstalk betweenbulk magnetization and electric polarization counterparts. Here we demonstratethat high magnetic fields of about 50 T are able to suppress the helicalmodulation of the spins in the multiferroic phase and dramatically affect theelectric polarization. Furthermore, just below the spontaneous transition fromcommensurate (paraelectric) to incommensurate (ferroelectric) structures at 213K, even modest magnetic fields induce a transition into the incommensuratestructure and then suppress it at higher field. Thus, remarkable hiddenmagnetoelectric features are uncovered, establishing CuO as prototypemultiferroic with abundance of competitive magnetic interactions.

Magnetoelectric effect and phase transitions in CuO in external magnetic fields