Original design of a patterned multiferroic heterostructure for electricalcontrol of the magnetic shape anisotropy

In the framework of piezoelectric/ferromagnetic patterned heterostructures, the purpose of this work is toelectrically control the magnetic properties by tuning the morphology, especially by modifying the magneticshape anisotropy through patterned strain. We have thus designed and studied a heterostructure with bottomnano-striped and top fullfilm electrodes. ZnO piezoelectric and CoFeB magnetic materials were chosen to re-spond at critical criteria of its geometry. In addition, numerical simulations and magnetostatic calculations wereperformed to understand the reproduction of the pattern across the multiferroic heterostructure. Calculationshave shown that the geometry of the heterostructure presents strict constraints, as for instance the distancebetween stripes versus the piezoelectric thickness. This study is a preliminary step towards reversible patterningof magnetic properties.