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Electric-Field-Adjustable Time-Dependent Magnetoelectric Response in Martensitic FeRh Alloy

Ignasi Fina, Alberto Quintana, Jessica Padilla-Pantoja, Xavier Marti, Ferran Macià, Florencio Sanchez, Michael Foerster, Lucia Aballe, Josep Fontcuberta, Jordi Sort. ACS Appl. Mater. Interfaces, Article ASAP. DOI: 10.1021/acsami.7b00476

Magnetoelectric materials, where magnetization can be switched by the application of an electric applied field, have been and are being under intensive study for data storage or brain-like computing schemes.

In our recent work, published in ACS Applied Materials & Interfaces, we report on a new twist on magnetoelectrics materials. We show that either static (time-independent) or dynamic (time dependent) magnetoelectric coupling can be obtained by using a voltage as a toggle.

Our approach exploits the modulation of the antiferromagnetic to ferromagnetic phase transition in metallic FeRh martensitic alloy by applying the electric field to a ferroelectric substrate (PMN-PT) underneath. Structural, magnetoelectric and magnetic imaging data reveals that the strain-limited antiferromagnetic to ferromagnetic phase transition determines the observed time-dependent magnetoelectric coupling. 

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