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Maksymovych, Peter; Huijben, Mark; Pan, Minghu; Jesse, Stephen; Balke, Nina; Chu, Ying Hao; Chang, Hye Jung; Borisevich, Albina Y.; Baddorf, Arthur P.; Rijnders, Guus; Blank, Dave H.A.; Ramesh, R.; Kalinin, Sergei V.

doi:10.1103/physrevb.85.014119

Cited by 72 publications

(60 citation statements)

References 34 publications

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“…This is because the Kay-Dunn law was derived from films with millimeter scale thickness, in which a switching process originated from nucleation. Yet in our work, the systems we studied are ultrathin films, and the polarization switching mechanism can be quite different due to the size effect [31,41]. We can see from the calculated domain configurations in Figure 5 that the domain width of the 4 nm film is much smaller than the width of the 32 nm film, which means that there are more domain boundaries in the 4 nm film.…”

Section: Resultsmentioning

confidence: 80%

“…Results showed that the sign of surface parameter would determine the trend of coercive field changing with film thickness. Dead-layer effects in polarization switching has also been studied in ultrathin BFO films using both experimental methods and statistical analysis [31]. Chen and Lynch [12] proposed a micromechanics model to study polarization switching in tetragonal and rhombohedral structures and found that it is easier to move 90 • (for tetragonal) and 70.5 • (for rhombohedral) domain walls than 180 • domain walls.…”

Section: Introductionmentioning

confidence: 99%

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Thickness Dependence of Switching Behavior in Ferroelectric BiFeO3 Thin Films: A Phase-Field Simulation

Cao

Huang

2017

Applied Sciences

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A phase-field approach to the analysis of the thickness effects in electric-field-induced domain switching in BiFeO 3 thin films has been formulated. Time evolutions of domain switching percentage for films with different thicknesses were explored to reveal the primary switching path and its dependence on film thickness. In addition, hysteresis loop for these films were calculated to obtain their coercive fields. Results show a nonlinear thickness dependence of coercive field for ultrathin films. A parametric study of the interactions between film thickness, coercive field, current-voltage (I-V) response, and polarization switching behavior is herein discussed, which could provide physical insights into materials engineering.

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Section: Resultsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Thickness Dependence of Switching Behavior in Ferroelectric BiFeO3 Thin Films: A Phase-Field Simulation

Cao

Huang

2017

Applied Sciences

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“…Unlike layered compounds, such as Fe-based superconductors and cuprates, which have pronounced 2D properties, most perovskites with the chemical formula ABO 3 exhibit drastic decreases in their functionalities under reduced dimensionality (i.e., ultrathin materials). This property has hindered the exploration and development of active low-dimensional materials (15,16). Therefore, exploring ultrathin materials confined by two interfaces is a rational approach to see whether interfacial effects can be exploited to achieve desired functionalities.…”

mentioning

confidence: 99%

Interface-induced multiferroism by design in complex oxide superlattices

Guo

Wang

Dong

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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Interfaces between materials present unique opportunities for the discovery of intriguing quantum phenomena. Here, we explore the possibility that, in the case of superlattices, if one of the layers is made ultrathin, unexpected properties can be induced between the two bracketing interfaces. We pursue this objective by combining advanced growth and characterization techniques with theoretical calculations. Using prototype La 2/3 Sr 1/3 MnO 3 (LSMO)/ BaTiO 3 (BTO) superlattices, we observe a structural evolution in the LSMO layers as a function of thickness. Atomic-resolution EM and spectroscopy reveal an unusual polar structure phase in ultrathin LSMO at a critical thickness caused by interfacing with the adjacent BTO layers, which is confirmed by first principles calculations. Most important is the fact that this polar phase is accompanied by reemergent ferromagnetism, making this system a potential candidate for ultrathin ferroelectrics with ferromagnetic ordering. Monte Carlo simulations illustrate the important role of spin-lattice coupling in LSMO. These results open up a conceptually intriguing recipe for developing functional ultrathin materials via interface-induced spin-lattice coupling.spin-lattice coupling | interfaces | magnetic/electric | structural transition | ultrathin films I nterface physics has emerged as one of the most popular methods to discover unique phenomena caused by broken symmetry (1-6). In transition metal oxide (TMO) interfaces, the different electronic, magnetic, lattice, and orbital properties of two adjoined materials lead to fascinating properties that are often radically different from those of the two component bulk materials (7-10). It would seem that we are on the verge of being able to design (11) or engineer (12) the properties of interfaces.Although the behavior of individual interfaces has been widely investigated, how two or more interfaces behave within superlattices (SLs) remains an interesting and open topic (13,14). As shown in Fig. 1A, when two interfaces are geometrically close enough, they can drastically alter the properties of the material in between because of proximity effects. Unlike layered compounds, such as Fe-based superconductors and cuprates, which have pronounced 2D properties, most perovskites with the chemical formula ABO 3 exhibit drastic decreases in their functionalities under reduced dimensionality (i.e., ultrathin materials). This property has hindered the exploration and development of active low-dimensional materials (15, 16). Therefore, exploring ultrathin materials confined by two interfaces is a rational approach to see whether interfacial effects can be exploited to achieve desired functionalities.In this work, we present an example of using the structural phase change induced by two adjacent interfaces as a route to design ultrathin TMOs. We choose two materials with distinct properties: BaTiO 3 (BTO), which in its bulk form, is polar ferroelectric, and La 2/3 Sr 1/3 MnO 3 (LSMO), which in its bulk form, is nonpolar/tilt ferromagnetic....

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“…Bulk BiFeO 3 exhibits antiferrodistortive (AFD) order at temperatures below 1200K; it is ferroelectric (FE) with a large spontaneous polarization below 1100 K and is antiferromagnetic (AFM) below Neel temperature T N ≈ 650 K [23,24]. The pronounced multiferroic properties maintain in BiFeO 3 thin films and heterostructures [25,26,27,28,29]. Despite extensive experimental and theoretical studies of the physical properties of bulk BiFeO 3 and its thin films [21 -23, 30, 31, 32, 33, 34, 35, 36, 37], many important issues concerning the emergence and theoretical background of multiferroic polar, magnetic and various electrophysical properties of BiFeO 3 nanoparticles remain almost unexplored [38,39].…”

Section: Multiferroic Bifeo 3 For Fundamental Studies and Advanced Apmentioning

confidence: 99%

Size effects of ferroelectric and magnetoelectric properties of semi-ellipsoidal bismuth ferrite nanoparticles

Khist

Eliseev

Glinchuk

et al. 2017

Journal of Alloys and Compounds

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Bismuth ferrite (BiFeO 3 ) is one of the most promising multiferroics with a sufficiently high ferroelectric (FE) and antiferromagnetic transition temperatures, and magnetoelectric (ME) coupling coefficient at room temperature, and thus it is highly sensitive to the impact of cross-influence of applied electric and magnetic fields. According to the urgent demands of nanotechnology miniaturization for ultra-high density data storage in advanced nonvolatile memory cells, it is very important to reduce the sizes of multiferroic nanoparticles in the self-assembled arrays without serious deterioration of their properties. We study size effects of the phase diagrams, FE and ME properties of semi-ellipsoidal BiFeO 3 nanoparticles clamped to a rigid conductive substrate. The spatial distribution of the spontaneous polarization vector inside the nanoparticles, phase diagrams and paramagnetoelectric (PME) coefficient were calculated in the framework of modified Landau-Ginzburg-Devonshire (LGD) approach. Analytical expressions were derived for the dependences of the FE transition temperature, average polarization, linear dielectric susceptibility and PME coefficient on the particle sizes for a general case of a semi-ellipsoidal nanoparticles with three different semi-axes a, b and height c. The analyses of the obtained results leads to the conclusion that the size effect of the phase diagrams, spontaneous polarization and PME coefficient is rather sensitive to the particle sizes aspect ratio in the polarization direction, and less sensitive to the absolute values of the sizes per se.

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Ultrathin limit and dead-layer effects in local polarization switching of BiFeO3

Cited by 72 publications

References 34 publications

Thickness Dependence of Switching Behavior in Ferroelectric BiFeO3 Thin Films: A Phase-Field Simulation

Thickness Dependence of Switching Behavior in Ferroelectric BiFeO3 Thin Films: A Phase-Field Simulation

Interface-induced multiferroism by design in complex oxide superlattices

Size effects of ferroelectric and magnetoelectric properties of semi-ellipsoidal bismuth ferrite nanoparticles

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