Dipole spring ferroelectrics in superlattice SrTiO3/BaTiO3 thin films exhibiting constricted hysteresis loops

作者：Wu, Pingping^*; Ma, Xingqiao; Li, Yulan; Gopalan, Venkatraman; Chen, Long-Qing

来源：Applied Physics Letters, 2012, 100(9): 092905.

DOI：10.1063/1.3691172

• barium compounds
• dielectric hysteresis
• ferroelectric coercive field
• ferroelectric materials
• ferroelectric switching
• ferroelectric thin films
• magnetic multilayers
• strontium compounds
• superlattices

Ferroelectric superlattice heterostructures have recently been explored for potential applications in electronic devices. In this letter, we employed the phase-field approach to simulate the domain structure and switching of a (BaTiO3)(8)/(SrTiO3)(3) superlattice film constrained by a GdScO3 substrate. A constricted ferroelectric hysteresis loop was observed with a high saturation polarization but a small coercive field. The shape of the hysteresis loop is understood by analyzing the ferroelectric polarization distributions during switching. It is demonstrated that the multilayers stack behaves as dipole spring ferroelectric, named in analogy to exchange spring magnets in magnetic multilayers that show similar loops.

• 出版日期2012-2-27
• 单位北京科技大学