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Pàgina inicial > Articles > Articles publicats > Magnetoelectric effect and phase transitions in CuO in external magnetic fields |
Data: | 2016 |
Resum: | 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 ≈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. Whilst CuO possesses spontaneous electrical polarization induced by its magnetic order, no magnetoelectric control of one by the other has been observed. Here, the authors demonstrate modification of the electrical polarization of CuO by suppressing its magnetic helix via an applied magnetic field. |
Ajuts: | European Commission 316309 Ministerio de Economía y Competitividad MAT2014-56063-C2-1-R Ministerio de Economía y Competitividad MAT2011-29269-C03 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-734 |
Drets: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió publicada |
Matèria: | Magnetic properties and materials ; Phase transitions and critical phenomena |
Publicat a: | Nature communications, Vol. 7 (Jan. 2016) , art. 10295, ISSN 2041-1723 |
8 p, 1.3 MB |