Transparent magnetoelectric materials for advanced invisible electronic applications

The need for flexible and transparent smart materials is leading to substantial advances in principles, material combinations, and technologies. Particularly, the development of optically transparent magnetoelectric (ME) materials will open the range of applications to new directions such as transparent sensors, touch display panels, multifunctional flat panel displays, and optical magnetic coatings. In this work, a flexible and transparent ME composite is made of magnetostrictive Fe72.5Si12.5B15 microwires and piezoelectric poly(vinylidene fluoride-trifluoroethylene). The high magnetostriction of Fe72.5Si12.5B15 (35 ppm) enables superior ME voltage response (65 mV cm(-1) Oe(-1)) obtained at the critical longitudinal magnetic field equating the transverse anisotropy (14500 A m(-1)) on the external shell of the microwire.R.P. and A.C.L. contributed equally to this work. The authors thank the FCT - Fundacao para a Ciencia e Tecnologia - for financial support in the framework of the Strategic Funding UID/FIS/04650/2013 and under project PTDC/EEI-SII/5582/2014. P.M., A.C.L., and N.P. also acknowledge support from FCT (SFRH/BPD/96227/2013, SFRH/BD/132624/2017, and SFRH/BD/131729/2017 grants, respectively). Financial support from MINECO - MAT2016-76039-C4-3-R (AEI/FEDER, UE), Basque Government - ELKARTEK and HAZITEK and PIBA (PIBA-2018-06) programs are also acknowledged. Financial support under the project S2018/NMT-4321 NANOMAGCOST-CM from the Regional Government of Madrid is acknowledged