Vertical Interface Effect on the Physical Properties of Self‐Assembled Nanocomposite Epitaxial Films

Yang, Hao; Wang, Haiyan; Yoon, Jungho; Wang, Yongqiang; Jain, M.; Dowden, P. C.; MacManus‐Driscoll, Judith L.; Jia, Q. X.

doi:10.1002/adma.200900781

Cited by 88 publications

(58 citation statements)

References 23 publications

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“…The vertical strain control in a VAN fi lm, which is different from conventional substrate strain control, has been demonstrated in previous reports. [18][19][20] This interesting vertical strain in LSMO:ZnO system stems from the out-of-plane lattice matching of 5 LSMO (001) planes with 6 ZnO ( 1120 ) planes. Figure 2 c illustrates the systematic variation of out-ofplane lattice parameters for d (001)LSMO × 5 and d(1120)ZnO × 6 as a function of deposition frequency.…”

Section: Resultsmentioning

confidence: 99%

“…[ 17 , 18 ] The VAN architecture has been reported in BiFeO 3 :Sm 2 O 3 , BiFeO 3 :NiFe 2 O 4 , and BaTiO 3 :CoFe 2 O 4 systems with vertical strain tuning, vertical interfacial coupling, and, thus, unique functionalities. [17][18][19][20][21][22] In addition, a thin-fi lm solid oxide fuel cell with a VAN interlayer of La 0.5 Sr 0.5 CoO 3 :Ce 0.9 Gd 0.1 O 1.95 has demonstrated a signifi cantly enhanced power performance. [ 23 ] By selecting two appropriate phases for the VAN structure, it is possible to grow a vertically aligned ferromagnetic-insulating-ferromagnetic (FM-I-FM) tunneling structure in an epitaxial thin-fi lm form.…”

Section: Resultsmentioning

confidence: 99%

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Tunable Low‐Field Magnetoresistance in (La_0.7Sr_0.3MnO₃)_0.5:(ZnO)_0.5 Self‐Assembled Vertically Aligned Nanocomposite Thin Films

Chen

Tsai

et al. 2011

Adv Funct Materials

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154

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Tunable and enhanced low‐field magnetoresistance (LFMR) is observed in epitaxial (La0.7Sr0.3MnO3)0.5:(ZnO)0.5 (LSMO:ZnO) self‐assembled vertically aligned nanocomposite (VAN) thin films, which have been grown on SrTiO3 (001) substrates by pulsed laser deposition (PLD). The enhanced LFMR properties of the VAN films reach values as high as 17.5% at 40 K and 30% at 154 K. They can be attributed to the spin‐polarized tunneling across the artificial vertical grain boundaries (GBs) introduced by the secondary ZnO nanocolumns and the enhancement of spin fluctuation depression at the spin‐disordered phase boundary regions. More interestingly, the vertical residual strain and the LFMR peak position of the VAN films can be systematically tuned by changing the deposition frequency. The tunability of the physical properties is associated with the vertical phase boundaries that change as a function of the deposition frequency. The results suggest that the tunable artificial vertical GB and spin‐disordered phase boundary in the unique VAN system with vertical ferromagnetic‐insulating‐ferromagnetic (FM‐I‐FM) structure provides a viable route to manipulate the low‐field magnetotransport properties in VAN films with favorable epitaxial quality.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Tunable Low‐Field Magnetoresistance in (La_0.7Sr_0.3MnO₃)_0.5:(ZnO)_0.5 Self‐Assembled Vertically Aligned Nanocomposite Thin Films

Chen

Tsai

et al. 2011

Adv Funct Materials

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179

154

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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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“…Continuous Pt layers with thickness of about 100 nm were then coated on the two sides of the BNF/AAO and AAO samples as electrodes by direct current sputtering for these electrical measurements. The BNF/AAO sample could be considered as a columnar composite film with 1-3 dimensional structure, whose leakage current would be controlled by the BNF because of the much higher resistance of AAO [15]. This means that the leakage current of the BNF nanotubes within the composite would be nearly the same as the total leakage current of the entire BNF/AAO composite film.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and ferroelectric properties of Nd doped multiferroic BiFeO3 nanotubes

Wang

Liu

et al. 2010

Chin. Sci. Bull.

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Nd doped multiferroic BiFeO 3 (Bi 0.94 Nd 0.06 FeO 3 (BNF)) nanotubes were successfully synthesized by a sol-gel template method. Electron microscopy investigations exhibited that these nanotubes had straight and smooth profile with diameters of about 200 nm and wall thickness of about 20 nm. A perovskite-type structure of BNF was confirmed in the nanotubes by high-resolution transmission electron microscopy and selected area electron diffraction analysis. These nanotubes had high resistivity. The dielectric constant and dielectric loss of the nanotubes were 126 and 0.040 at 1 MHz, respectively. The ferroelectric properties of these BNF nanotubes were demonstrated with a remnant polarization of 48 μC/cm 2 and a coercive electric field of 163 kV/cm. multiferroic BiFeO 3 , Nd 3+ doping, nanotubes, sol-gel technique, ferroelectricity Citation: Wang J, Li M Y, Liu X L, et al. Synthesis and ferroelectric properties of Nd doped multiferroic BiFeO 3 nanotubes.

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Vertical Interface Effect on the Physical Properties of Self‐Assembled Nanocomposite Epitaxial Films

Cited by 88 publications

References 23 publications

Tunable Low‐Field Magnetoresistance in (La_0.7Sr_0.3MnO₃)_0.5:(ZnO)_0.5 Self‐Assembled Vertically Aligned Nanocomposite Thin Films

Tunable Low‐Field Magnetoresistance in (La_0.7Sr_0.3MnO₃)_0.5:(ZnO)_0.5 Self‐Assembled Vertically Aligned Nanocomposite Thin Films

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

Synthesis and ferroelectric properties of Nd doped multiferroic BiFeO3 nanotubes

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Vertical Interface Effect on the Physical Properties of Self‐Assembled Nanocomposite Epitaxial Films

Cited by 88 publications

References 23 publications

Tunable Low‐Field Magnetoresistance in (La0.7Sr0.3MnO3)0.5:(ZnO)0.5 Self‐Assembled Vertically Aligned Nanocomposite Thin Films

Tunable Low‐Field Magnetoresistance in (La0.7Sr0.3MnO3)0.5:(ZnO)0.5 Self‐Assembled Vertically Aligned Nanocomposite Thin Films

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

Synthesis and ferroelectric properties of Nd doped multiferroic BiFeO3 nanotubes

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Product

Resources

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Tunable Low‐Field Magnetoresistance in (La_0.7Sr_0.3MnO₃)_0.5:(ZnO)_0.5 Self‐Assembled Vertically Aligned Nanocomposite Thin Films

Tunable Low‐Field Magnetoresistance in (La_0.7Sr_0.3MnO₃)_0.5:(ZnO)_0.5 Self‐Assembled Vertically Aligned Nanocomposite Thin Films