Due to the strong magneto-elastic coupling in ferromagnetic/ferroelectric heterostructures and the potential applications in lowpower magnetoelectric nanodevices,ferroelastic domains and the corresponding dynamic evol...Due to the strong magneto-elastic coupling in ferromagnetic/ferroelectric heterostructures and the potential applications in lowpower magnetoelectric nanodevices,ferroelastic domains and the corresponding dynamic evolution under external stimuli have attracted intense research interest.Using pulsed laser deposition method,we have successfully grown layered-perovskite Bi_(2)WO_(6)thin films on SrTiO_(3)(001)substrates.Interestingly,for the as-grown thin films with step-flow morphology,the relationship between ferroelastic domain number and size shows a normal distribution,which is similar to the Boltzman distribution for confined gas molecules at equilibrium.In addition,with post-annealing,the thin films with as-grown island-like morphology can be optimized for layered morphology,and the initial small ferroelastic domains can grow into large domains.This study provides an effective strategy for ferroelastic domain engineering,which can be applied for the design of multiferroic heterostructures and low-power nanodevices.展开更多
Ferroelectric materials are widely used in the applications of electronic devices due to their robust spontaneous polarization.The surface roughness of ferroelectric thin films,which is closely related to the morpholo...Ferroelectric materials are widely used in the applications of electronic devices due to their robust spontaneous polarization.The surface roughness of ferroelectric thin films,which is closely related to the morphology,can play an important role in determining the ferroelectric domain structures.In this work,we have investigated the influence of annealing conditions on the surface morphology of epitaxial BiFeO_(3)and SrRuO_(3)thin films prepared by pulsed laser deposition on SrTiO_(3)(001)substrates.It is found that the morphology of the thin films is sensitive to the annealing time and cooling rate,and the corresponding surface roughness decreases with increasing annealing time and decreasing cooling rate.In addition,the ferroelectric domain structures of BiFeO_(3)films have been investigated by piezoelectric force microscopy,which shows a significant improvement in domain size and reverse piezoelectric response in the thin films with decreasing surface roughness.This work provides a simple way to predict and improve the ferroelectric domain structures by in situ annealing.展开更多
基金supported by the NSF of China(Grant No.12004036)State Key Laboratory of New Ceramic and Fine Processing Tsinghua University(No.KFZD202201).
文摘Due to the strong magneto-elastic coupling in ferromagnetic/ferroelectric heterostructures and the potential applications in lowpower magnetoelectric nanodevices,ferroelastic domains and the corresponding dynamic evolution under external stimuli have attracted intense research interest.Using pulsed laser deposition method,we have successfully grown layered-perovskite Bi_(2)WO_(6)thin films on SrTiO_(3)(001)substrates.Interestingly,for the as-grown thin films with step-flow morphology,the relationship between ferroelastic domain number and size shows a normal distribution,which is similar to the Boltzman distribution for confined gas molecules at equilibrium.In addition,with post-annealing,the thin films with as-grown island-like morphology can be optimized for layered morphology,and the initial small ferroelastic domains can grow into large domains.This study provides an effective strategy for ferroelastic domain engineering,which can be applied for the design of multiferroic heterostructures and low-power nanodevices.
基金supported by the NSF of China(Grant No.12004036)State Key Laboratory of New Ceramic and Fine Processing Tsinghua University(No.KFZD202201).
文摘Ferroelectric materials are widely used in the applications of electronic devices due to their robust spontaneous polarization.The surface roughness of ferroelectric thin films,which is closely related to the morphology,can play an important role in determining the ferroelectric domain structures.In this work,we have investigated the influence of annealing conditions on the surface morphology of epitaxial BiFeO_(3)and SrRuO_(3)thin films prepared by pulsed laser deposition on SrTiO_(3)(001)substrates.It is found that the morphology of the thin films is sensitive to the annealing time and cooling rate,and the corresponding surface roughness decreases with increasing annealing time and decreasing cooling rate.In addition,the ferroelectric domain structures of BiFeO_(3)films have been investigated by piezoelectric force microscopy,which shows a significant improvement in domain size and reverse piezoelectric response in the thin films with decreasing surface roughness.This work provides a simple way to predict and improve the ferroelectric domain structures by in situ annealing.
基金supported by the National Key R&D Program of China through Contract 2021YFA0718700the final support from the National Natural Science Foundation of China(11974052 and 12004036)+1 种基金Beijing Natural Science Foundation(Z190008)the Natural Science Basic Research Program of Shaanxi(2021JQ-332)。
