Magnetic spin structure and magnetoelectric coupling in BiFeO3-BaTiO3 multilayer

Lazenka, Vera; Lorenz, Michael; Modarresi, Hiwa; Bisht, Manisha; Rüffer, R.; Bonholzer, Michael; Grundmann, Marius; Bael, M. J. Van; Vantomme, André; Temst, Kristiaan

doi:10.1063/1.4913444

Cited by 28 publications

(35 citation statements)

References 23 publications

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“…, along the ME voltage in longitudinal geometry. For more details and corresponding ME measurements on BiFeO 3 -based bulk samples and BiFeO 3 films, see [36] and [23], respectively.…”

Section: Methodsmentioning

confidence: 99%

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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“…, along the ME voltage in longitudinal geometry. For more details and corresponding ME measurements on BiFeO 3 -based bulk samples and BiFeO 3 films, see [36] and [23], respectively.…”

Section: Methodsmentioning

confidence: 99%

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

et al. 2016

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“…In addition, the SL period has been calculated from the distance between adjacent satellite peaks using the relationship L ¼ k=ð2Dh Á cos h B Þ, where k is the X-ray wavelength, Dh is the angular separation between two adjacent satellite peaks, and h B is the Bragg angle of the zero-order satellite peak. 15 More detailed structural insights are obtained by HR-TEM. Fig.…”

Section: A)mentioning

confidence: 99%

“…SrTiO 3 (STO) single crystals with (001) and (111) orientation and low miscut below 0. 15 were selected as substrates. Before the PLD process, substrates were etched in diluted hydrogen fluoride solution and annealed under oxygen atmosphere in order to obtain a surface terminated with terraced monolayer steps.…”

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confidence: 99%

Charge transfer-induced magnetic exchange bias and electron localization in (111)- and (001)-oriented LaNiO3/LaMnO3 superlattices

Wei

Barzola‐Quiquia

Yang

et al. 2017

Applied Physics Letters

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High-quality lattice-matched LaNiO3/LaMnO3 superlattices with monolayer terrace structure have been grown on both (111)- and (001)-oriented SrTiO3 substrates by pulsed laser deposition. In contrast to the previously reported experiments, a magnetic exchange bias is observed that reproducibly occurs in both (111)- and (001)-oriented superlattices with the thin single layers of 5 and 7 unit cells, respectively. The exchange bias is theoretically explained by charge transfer-induced magnetic moments at Ni atoms. Furthermore, magnetization data at low temperature suggest two magnetic phases in the superlattices, with Néel temperature around 10 K. Electrical transport measurements reveal a metal-insulator transition with strong localization of electrons in the superlattices with the thin LaNiO3 layers of 4 unit cells, in which the electrical transport is dominated by two-dimensional variable range hopping.

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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).…”

mentioning

confidence: 99%

“…This strain is mechanically transferred to the magnetic component, inducing a magnetization change through the piezomagnetic effect. 10,11 Thin multilayered films with strong out-of-plane (OOP) magnetic anisotropy, i.e., magnetization aligned perpendicular to the film surface, are the best candidates for next-generation non-volatile memory. In such systems, there is a large energy barrier for magnetization switching, implying higher stability of the magnetization states, and lower critical current for spintransfer torque memory devices.…”

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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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Magnetic spin structure and magnetoelectric coupling in BiFeO3-BaTiO3 multilayer

Cited by 28 publications

References 23 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

Charge transfer-induced magnetic exchange bias and electron localization in (111)- and (001)-oriented LaNiO3/LaMnO3 superlattices

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

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