  Magnetoelastic and magnetoelectric coupling in the artificial multiferroic
heterostructures facilitate valuable features for device applications such as
magnetic field sensors and electric write magnetic-read memory devices. In a
ferromagnetic/ferroelectric heterostructures, the strain mediated coupling
exploits piezoelectricity/electrostriction in ferroelectric phase and
magnetostriction/piezomagnetism in ferromagnetic phase. Such verity of these
combined effect can be manipulated by an external perturbation, such as
electric field, temperature or magnetic field. Here, we demonstrate the
remote-controlled tunability of these effects under the visible, coherent and
polarized light. The combined surface and bulk magnetic study of
domain-correlated Ni/BaTiO3 heterostructure reveals that the system is strong
sensitive about the light illumination via the combined effect of converse
piezoelectric, magnetoelastic coupling and converse magnetostriction.
Well-defined ferroelastic domain structure is fully transferred from a
tetragonal ferroelectric to magnetostrictive layer via interface strain
transfer during the film growth. The visible light illumination is used to
manipulate the original ferromagnetic microstructure by the light-induced
domain wall motion in ferroelectric, consequently the domain wall motion in the
ferromagnetic layer. Our findings mimic the attractive remote-controlled
ferroelectric random-access memory write and magnetic random-access memory read
application scenarios, hence, can be proven as a novel perspective for room
temperature device applications.
