Correlation of magnetoelectric coupling in multiferroic BaTiO3-BiFeO3 superlattices with oxygen vacancies and antiphase octahedral rotations

Lorenz, Michael; Wagner, G.; Lazenka, Vera; Schwinkendorf, Peter; Modarresi, Hiwa; Bael, M. J. Van; Vantomme, André; Temst, Kristiaan; Oeckler, Oliver; Grundmann, Marius

doi:10.1063/1.4905343

Cited by 68 publications

(73 citation statements)

References 19 publications

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“…The magnetoelectric coupling of the composite films increases with decreasing temperature, in contrast to that of our recently-reported BaTO 3 -BiFeO 3 superlattices consisting of 15 pairs of stacked thin BaTiO 3 and BiFeO 3 layers; see [22]. We assume that in superlattice heterostructures with clearly separated phases, as reported in [11,22,23], the magnetoelectric coupling is dominated by magnetostrictive-piezoelectric interaction coupled via strain at the interfaces of both phases.…”

Section: Resultsmentioning

confidence: 71%

“…In continuation of this latter work on BiFeO 3 , we found that the ME coefficient of single-phase BiFeO 3 thin films can be considerably enhanced by combination with the ferroelectric BaTiO 3 in both superlattices and in chemically-homogeneous composite thin films [11,22,23]. In particular, while a BiFeO 3 film showed an α ME of about 2 V/(cm·Oe), the corresponding (BaTiO 3 -BiFeO 3 ) × 15 superlattice showed 9 V/(cm·Oe) at 300 K, clearly demonstrating the interface effect on the magnetic moment direction and magnetoelectric coupling, as published in [23].…”

Section: Introductionmentioning

confidence: 98%

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Correlation of High Magnetoelectric Coupling with Oxygen Vacancy Superstructure in Epitaxial Multiferroic BaTiO3-BiFeO3 Composite Thin Films

et al. 2016

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Epitaxial multiferroic BaTiO3-BiFeO3 composite thin films exhibit a correlation between the magnetoelectric (ME) voltage coefficient αME and the oxygen partial pressure during growth. The ME coefficient αME reaches high values up to 43 V/(cm·Oe) at 300 K and at 0.25 mbar oxygen growth pressure. The temperature dependence of αME of the composite films is opposite that of recently-reported BaTiO3-BiFeO3 superlattices, indicating that strain-mediated ME coupling alone cannot explain its origin. Probably, charge-mediated ME coupling may play a role in the composite films. Furthermore, the chemically-homogeneous composite films show an oxygen vacancy superstructure, which arises from vacancy ordering on the {111} planes of the pseudocubic BaTiO3-type structure. This work contributes to the understanding of magnetoelectric coupling as a complex and sensitive interplay of chemical, structural and geometrical issues of the BaTiO3-BiFeO3 composite system and, thus, paves the way to practical exploitation of magnetoelectric composites.

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Section: Resultsmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 98%

Correlation of High Magnetoelectric Coupling with Oxygen Vacancy Superstructure in Epitaxial Multiferroic BaTiO3-BiFeO3 Composite Thin Films

et al. 2016

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“…The overall behavior of the ME coefficient curves for the BiFeO 3 -BaTiO 3 superlattices is in agreement with our previous work. 11,29 The ME coefficient increases with increasing magnetic field and saturates around 3 T for the sample containing 20 double layers and around 1 T for the other samples (Fig. 4).…”

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confidence: 99%

Interface induced out-of-plane magnetic anisotropy in magnetoelectric BiFeO3-BaTiO3 superlattices

Lazenka

Jochum

Lorenz

et al. 2017

Applied Physics Letters

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Room temperature magnetoelectric BiFeO3-BaTiO3 superlattices with strong out-of-plane magnetic anisotropy have been prepared by pulsed laser deposition. We show that the out-of-plane magnetization component increases with the increasing number of double layers. Moreover, the magnetoelectric voltage coefficient can be tuned by varying the number of interfaces, reaching a maximum value of 29 V/cm Oe for the 20×BiFeO3-BaTiO3 superlattice. This enhancement is accompanied by a high degree of perpendicular magnetic anisotropy, making the latter an ideal candidate for the next generation of data storage devices.

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“…The giant enhancement of the ME coupling, which was reported in Refs. [39,41], probably requires additional mechanisms, such as the structural and magnetic reconstruction in the critical electric field, as was proposed in Refs. [42][43][44].…”

Section: B Linear Magnetoelectric Effect In Bifeomentioning

confidence: 95%

Superexchange theory of electronic polarization driven by relativistic spin-orbit interaction at half filling

Solovyev

2017

Phys. Rev. B

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By applying Berry-phase theory for the effective half-filled Hubbard model, we derive an analytical expression for the electronic polarization driven by the relativistic spin-orbit (SO) coupling.The model itself is constructed in the Wannier basis, using the input from the first-principles electronic structure calculations in the local-density approximation, and then treated in the spirit of the superexchange theory. The obtained polarization has the following form:where ǫ ji is the direction of the bond ij , e i and e j are the directions of spins in this bond, and P ij is the pseudovector containing all the information about the crystallographic symmetry of the considered system. The expression describes the ferroelectric activity in various magnets with noncollinear but otherwise nonpolar magnetic structures, which would yield no polarization without SO interaction, including the magnetoelectric (ME) effect, caused by the ferromagnetic canting of spins in the external magnetic field, and spin-spiral multiferroics. The abilities of this theory are demonstrated for the the analysis of linear ME effect in Cr 2 O 3 and BiFeO 3 and properties multiferroic MnWO 4 and β-MnO 2 . In all considered examples, the theory perfectly describes the symmetry properties of the induced polarization. However, in some cases, the values of this polarization are underestimated, suggesting that other effects, besides the spin and electronic ones, can also play an important role. * SOLOVYEV.Igor@nims.go.jp

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Correlation of magnetoelectric coupling in multiferroic BaTiO3-BiFeO3 superlattices with oxygen vacancies and antiphase octahedral rotations

Cited by 68 publications

References 19 publications

Correlation of High Magnetoelectric Coupling with Oxygen Vacancy Superstructure in Epitaxial Multiferroic BaTiO3-BiFeO3 Composite Thin Films

Correlation of High Magnetoelectric Coupling with Oxygen Vacancy Superstructure in Epitaxial Multiferroic BaTiO3-BiFeO3 Composite Thin Films

Interface induced out-of-plane magnetic anisotropy in magnetoelectric BiFeO3-BaTiO3 superlattices

Superexchange theory of electronic polarization driven by relativistic spin-orbit interaction at half filling

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