Epitaxial Bi5Ti3FeO15–CoFe2O4 Pillar–Matrix Multiferroic Nanostructures

Imai, Akira; Cheng, Xuan; Xin, Huolin L.; Eliseev, Eugene A.; Morozovska, Anna N.; Kalinin, Sergei V.; Takahashi, Ryota; Lippmaa, Mikk; Matsumoto, Yuji; Valanoor, Nagarajan

doi:10.1021/nn404779x

Cited by 56 publications

(35 citation statements)

References 24 publications

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“…Although this review might not cover all findings in this research field, we hope that it will help the readers to quickly jump into the field of ionic devices based on VAN films. If the readers are interested in other applications, such as electric and magnetic properties of VAN films, there are several reviews [54][55][56] and reports [57][58][59][60][61][62][63][64][65][66][67][68][69] which are worth reading.…”

Section: New Device Architectures For Ionic Devicesmentioning

confidence: 99%

Research Update: Fast and tunable nanoionics in vertically aligned nanostructured films

Lee

MacManus‐Driscoll

2017

APL Materials

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This review provides the design principles to develop new nanoionic applications using vertically aligned nanostructured (VAN) thin films, incorporating two phases which self-assemble in one film. Tunable nanoionics has attracted great attention for energy and device applications, such as ion batteries, solid oxide fuel cells, catalysts, memories, and neuromorphic devices. Among many proposed device architectures, VAN films have strong potential for nanoionic applications since they show enhanced ionic conductivity and tunability. Here, we will review the recent progress on state-of-the-art nanoionic applications, which have been realized by using VAN films. In many VAN systems made by the inclusion of an oxygen ionic insulator, it is found that ions flow through the vertical heterointerfaces. The observation is consistent with structural incompatibility at the vertical heteroepitaxial interfaces resulting in oxygen deficiency in one of the phases and hence to oxygen ion conducting pathways. In other VAN systems where one of the phases is an ionic conductor, ions flow much faster within the ionic conducting phase than within the corresponding plain film. The improved ionic conduction coincides with much improved crystallinity in the ionically conducting nanocolumnar phase, induced by use of the VAN structure. Furthermore, for both cases Joule heating effects induced by localized ionic current flow also play a role for enhanced ionic conductivity. Nanocolumn stoichiometry and strain are other important parameters for tuning ionic conductivity in VAN films. Finally, double-layered VAN film architectures are discussed from the perspective of stabilizing VAN structures which would be less stable and hence less perfect when grown on standard substrates.

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Section: New Device Architectures For Ionic Devicesmentioning

confidence: 99%

Research Update: Fast and tunable nanoionics in vertically aligned nanostructured films

Lee

MacManus‐Driscoll

2017

APL Materials

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“…Moreover, mutliferroic (MF) properties of the coexistence of magnetic, ferroelectric and/or ferroelastic orderings in one phase can be realized by inserting the typical MF BiFeO 3 phase into the isostructural Bi 4 Ti 3 O 12 BLFs, whose formula is expressed as Bi 4 Bi n-3 Ti 3 Fe n-3 O 3n+3 (n is an integer greater than or equal to 4, denoting the number of perovskite layer). More importantly, an associated magnetoelectric (ME) coupling between spin and dipolar orderings drives them to be qualified in the high-speed and low-power consumption multi-state memory, spintronics devices and even in photovoltaic cells56789101112131415. Nevertheless, the nature of antiferromagnetic ordering and weak ME coupling of Aurivillius MF phases restricts their prospects of the practical application67891011121314.…”

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confidence: 99%

Dielectric behaviors of Aurivillius Bi5Ti3Fe0.5Cr0.5O15 multiferroic polycrystals: Determining the intrinsic magnetoelectric responses by impedance spectroscopy

Bai

Chen

Yang

et al. 2015

Sci Rep

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Bismuth layer ferroelectrics (BLFs) pioneered by Aurivillius about sixty years ago have been revived recently because of the fatigue- and lead-free behaviors and high Curie temperature, and especially the robust magnetoelectric (ME) effect. However, discerning the intrinsic ME nature, and the inherence between charged defect dipole induced relaxation and spin-related behaviors are still an arduous task. Here, we report a quantitative analysis to reveal the intrinsic spin-lattice coupling in Aurivillius Cr-doped Bi5Ti3FeO15 (BTFCO) multiferroic polycrystals. Dielectric responses are systemically investigated by the temperature-dependent dielectric, module, impedance spectroscopy and equivalent circuit model, and two different dielectric relaxation processes occurred in grain interior of Aurivillius BTFCO polycrystals are clarified. One relaxation is proposed to associate with localized transfer of electrons between Fe3+ and Fe2+ while another one arises from the competition interaction of localized hopping of electrons between Fe3+ and Fe2+ and short-range migration of holes between Cr3+ and Cr6+. The variation of the intrinsic permittivity unambiguously confirms the coupling between spin and dipolar orderings in BTFCO polycrystals. These results offer a vital avenue for identifying the intrinsic and extrinsic signals of the electric and ME responses, and will give significant impetus to exploring the ME electronic devices of Aurivillius materials.

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“…Very recently, the epitaxial Bi 5 Ti 3 FeO 15 -CoFe 2 O 4 multiferroic nanostructures were fabricated and shown how polarization and magnetism can be manipulated by stress in this system14. Unfortunately, such engineered ferroic/magnetoelectric behaviour is still limited by the coupling intensity, application temperature, and application suitability.…”

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confidence: 99%

Large magnetoelectric coupling in magnetically short-range ordered Bi5Ti3FeO15 film

Zhao

Kimura

Cheng

et al. 2014

Sci Rep

141

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Multiferroic materials, which offer the possibility of manipulating the magnetic state by an electric field or vice versa, are of great current interest. However, single-phase materials with such cross-coupling properties at room temperature exist rarely in nature; new design of nano-engineered thin films with a strong magneto-electric coupling is a fundamental challenge. Here we demonstrate a robust room-temperature magneto-electric coupling in a bismuth-layer-structured ferroelectric Bi5Ti3FeO15 with high ferroelectric Curie temperature of ~1000 K. Bi5Ti3FeO15 thin films grown by pulsed laser deposition are single-phase layered perovskit with nearly (00l)-orientation. Room-temperature multiferroic behavior is demonstrated by a large modulation in magneto-polarization and magneto-dielectric responses. Local structural characterizations by transmission electron microscopy and Mössbauer spectroscopy reveal the existence of Fe-rich nanodomains, which cause a short-range magnetic ordering at ~620 K. In Bi5Ti3FeO15 with a stable ferroelectric order, the spin canting of magnetic-ion-based nanodomains via the Dzyaloshinskii-Moriya interaction might yield a robust magneto-electric coupling of ~400 mV/Oe·cm even at room temperature.

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Epitaxial Bi₅Ti₃FeO₁₅–CoFe₂O₄ Pillar–Matrix Multiferroic Nanostructures

Cited by 56 publications

References 24 publications

Research Update: Fast and tunable nanoionics in vertically aligned nanostructured films

Research Update: Fast and tunable nanoionics in vertically aligned nanostructured films

Dielectric behaviors of Aurivillius Bi5Ti3Fe0.5Cr0.5O15 multiferroic polycrystals: Determining the intrinsic magnetoelectric responses by impedance spectroscopy

Large magnetoelectric coupling in magnetically short-range ordered Bi5Ti3FeO15 film

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