Steady or dynamic magnetoelectric response, selectable and adjustable by only varying the amplitude of the applied electric field, is found in a multiferroic FeRh/PMN-PT device. In-operando time-dependent structural, ferroelectric, and magnetoelectric characterizations provide evidence that, as in magnetic shape memory martensitic alloys, the observed distinctive magnetoelectric responses are related to the time-dependent relative abundance of antiferromagnetic-ferromagnetic phases in FeRh, unbalanced by voltage-controlled strain. This flexible magnetoelectric response can be exploited not only for energy-efficient memory operations but also in other applications, where multilevel and/or transient responses are required.

ALBA Synchrotron Light Facility Carrer de la Llum 2 26 Cerdanyola del Vallès 08290 Barcelona Spain

Catalan Institute of Nanoscience and Nanotechnology CSIC and The Barcelona Institute of Science and Technology Campus UAB Bellaterra E 08193 Barcelona Spain

Departament de Física Universitat Autònoma de Barcelona Bellaterra E 08193 Barcelona Spain

Institució Catalana de Recerca i Estudis Avançats Pg Lluís Companys 23 E 08010 Barcelona Spain

Institut de Ciència de Materials de Barcelona Campus UAB Bellaterra E 08193 Barcelona Spain

Institute of Physics Academy of Sciences of the Czech Republic Cukrovarnická 10 162 53 Praha 6 Czech Republic

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Hidden Magnetic States Emergent Under Electric Field, In A Room Temperature Composite Magnetoelectric Multiferroic