Journal
PHYSICAL REVIEW MATERIALS
Volume 5, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevMaterials.5.024401
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Funding
- NSF Nanosystems Engineering Research Center for Translational Applications of the Nanoscale Multiferroic Systems (TANMS) [EEC-1160504]
- Office of Science, Office of Basic Energy Sciences, U.S. Department of Energy [DE-AC02-05CH11231]
- U.S. Department of Energy [DE-AC52-07NA27344]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division within the Nonequilibrium Magnetic Materials Program (MSMAG) [DE-AC02-05CH11231]
- National Science Foundation Center for Energy Efficient Electronics Science
- Basque Government
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This study investigates the impact of dislocations and twin walls in BaTiO3 on its ferroelectric response and the resulting effect on the perpendicular magnetic anisotropy of a strain-coupled [Co\Ni](n) film. Results show that a dense twinned structure and high dislocation density significantly reduce the converse piezoelectric effect of BaTiO3, while a dislocation-free BaTiO3 induces a larger in-plane compressive strain.
We investigate the influence of dislocations and twin walls in BaTiO3 on its ferroelectric response and the resulting effect on the perpendicular magnetic anisotropy (PMA) of a strain-coupled [Co\Ni](n) film. A dense twinned structure in conjunction with a high dislocation density significantly reduces the converse piezoelectric effect of BaTiO3 by hindering the propagation of newly nucleated domains with an applied electric field. This, in turn, results in a modest reduction of the PMA of the ferromagnetic layer. On the other hand, the ferroelectric polarization reorients from [100] to [001] direction in a dislocation-free BaTiO3, inducing the maximum achievable in-plane compressive strain of 1.1%. A large fraction of this uniaxial strain is transferred to the magnetoelastically coupled ferromagnetic layers whose magnetization switches to in plane via the inverse magnetostriction effect. This work reveals the critical role of the interplay between twin walls and dislocations within a ferroelectric substrate in the performance of multiferroic heterostructures and provides insight into the development of highly energy-efficient magnetoelectric devices.
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