Large Longitudinal Magnetoelectric Coupling in NiFe₂O₄–BaTiO₃Laminates

Abstract

In contrast to the Pb-based magnetoelectric laminates (MELs), we find in the\nBaTiO3 and NiFe2O4 laminates (number of layers n = 5-25) that the longitudinal\nmagnetoelectric (ME) voltage coefficient Alpha E33 becomes much larger than the\ntransverse one due to preferential alignment of magnetic moments along the\nNiFe2O4 plane. Moreover, upon decreasing each layer thickness down to 15 um, we\nrealize enhanced Alpha E33 up to 18 mV/ (cm Oe) and systematic increase of the\nME sensitivity in proportion to n to achieve the largest in the Pb-free MELs\n(400*10^-6V/Oe), thereby providing pathways for tailoring ME coupling in\nmass-produced, environment friendly laminates.\n