Virginia TechWang, Z.Wang, Y.Ge, WenweiLi, J.Viehland, Dwight D.2014-01-212014-01-212013-09-01Wang, Z.; Wang, Y.; Ge, W.; et al., "Volatile and nonvolatile magnetic easy-axis rotation in epitaxial ferromagnetic thin films on ferroelectric single crystal substrates," Appl. Phys. Lett. 103, 132909 (2013); http://dx.doi.org/10.1063/1.48235390003-6951http://hdl.handle.net/10919/24950We explored the relationship between phase transformation and magnetoelectric effect by depositing epitaxial CoFe2O4 films on < 110 > oriented Pb(Mg,Nb)O-3-PbTiO3 (PMN-PT) with three different PbTiO3 contents (PMN-28PT, PMN-29.5PT, and PMN-30PT). Electric-field controlled rhombohedral to orthorhombic phase transformation was confirmed by both piezoelectric and dielectric constant measurements. A giant in-plane (IP) uniaxial strain in CoFe2O4 film was induced due to dramatic lattice parameter change trigged by phase transition. Magnetic easy axis can be rotated from IP < 110 > to IP < 001 >. More importantly, the phase transformation could be either reversible or irreversible, resulting in either volatile or nonvolatile magnetic easy axis rotations. (C) 2013 AIP Publishing LLC.application/pdfen-USIn CopyrightPiezoelectric propertiesHeterostructuresStrainBehaviorVoltagePolarizationPhysicsArticle - Refereedhttp://scitation.aip.org/content/aip/journal/apl/103/13/10.1063/1.4823539https://doi.org/10.1063/1.4823539