Journal
NATURE COMMUNICATIONS
Volume 7, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms10295
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Funding
- Institute Laue Langevin (ILL-Grenoble)
- HLD at HZDR
- Bulgarian Science Fund [FNI-T-02/26]
- DFG [SFB 1143]
- French ANR 'Dymage' project [ANR-13-BS04-0013]
- Spanish Government [MAT2011-29269-C03, MAT2014-56063-C2-1-R]
- Generalitat de Catalunya project [SGR 734]
- INERA EU project [REGPOT 2012-2013-1]
- CNPq [407033/2013-0]
- CAPES [BEX 0298/2015-08]
- Russian Foundation for Basic Researches project [13-02-01093]
- ICREA Funding Source: Custom
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Apart from being so far the only known binary multiferroic compound, CuO has a much higher transition temperature into the multiferroic state, 230 K, than any other known material in which the electric polarization is induced by spontaneous magnetic order, typically lower than 100 K. Although the magnetically induced ferroelectricity of CuO is firmly established, no magnetoelectric effect has been observed so far as direct crosstalk between bulk magnetization and electric polarization counterparts. Here we demonstrate that high magnetic fields of approximate to 50 T are able to suppress the helical modulation of the spins in the multiferroic phase and dramatically affect the electric polarization. Furthermore, just below the spontaneous transition from commensurate (paraelectric) to incommensurate (ferroelectric) structures at 213 K, even modest magnetic fields induce a transition into the incommensurate structure and then suppress it at higher field. Thus, remarkable hidden magnetoelectric features are uncovered, establishing CuO as prototype multiferroic with abundance of competitive magnetic interactions.
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