This paper presents an efficient, environmentally friendly, and simple approach for the green synthesis of ZnO nanoparticles (ZnO NPs) using orange fruit peel extract.

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We have investigated the magnetic properties of transition-metal oxide superlattices with broken inversion symmetry composed of three different antiferromagnetic insulators, ͓NdMnO 3 / SrMnO 3 / LaMnO 3 ͔. In the superlattices studied here, we identify the emergence of a relaxor, glassylike behavior below T SG = 36 K. Our results offer the possibility to study and utilize magnetically metastable devices confined at nanoscale interfaces.Heterostructures of materials with strong electronelectron and electron-lattice interactions, the so-called correlated electron systems, are potential candidates for emergent interfacial properties including various forms of spin, charge, and orbital ordering absent in bulk materials. Promising examples include multilayers composed of insulators of LaAlO 3 and SrTiO 3 with interfaces displaying properties of quasi-two-dimensional electron gases, 1 superconductivity, 2 metallic conductivity, 3-5 and ferromagnetism ͑FM͒. 6 The multilayers composed of antiferromagnetic ͑AF͒ insulators in bulk forms, LaMnO 3 and SrMnO 3 are also examples of emergent electromagnetic properties at the interfaces between dissimilar manganites. 7-12 It has been demonstrated that these superlattices could posses FM order at the interfaces due to a charge reconstruction, although each parent material is an AF. 11 The competitive interaction between the reconstructed FM at interfaces and the AF states present far from the interface regions has been suggested to lead to a frustrated/glasslike behavior. 12,13 Small external perturbation in glasslike correlated electron thin-film devices, at a "caged" nanostructured interface, in particular, is expected to lead to high degree of tunability. These include, magnetoelectronics such as spin and charge memory devices at the atomic scale.Here we report on the relaxor and spin-glass ͑SG͒-like properties arising at the interface of superlattices, composed of insulating manganites: LaMnO 3 , SrMnO 3 , and NdMnO 3 , which are A-, G-, and A-type AF, respectively. Superlattices of ͓͑NdMnO 3 ͒ n / ͑SrMnO 3 ͒ n / ͑LaMnO 3 ͒ n ͔ m were grown epitaxially on single-crystalline SrTiO 3 substrates at an ambient oxygen/ozone mixture of 10 −4 Torr by layer-by-layer growth technology using the laser molecular-beam epitaxy technique. The details were reported in an earlier work. 14 Figure 1͑a͒ depicts a schematic drawing of a superlattice with n = 5 studied here with alternate A sites around the octahedra representing MnO 6 in the ABO 3 perovskite. The total thickness of the superlattices was kept approximately 500 Å varying ͑n , m͒ = ͑1 unit cell, 42͒, ͑2, 21͒, ͑5, 8͒, and ͑12, 4͒ in order to investigate the effect of the period. Structural characterization using synchrotron x-ray diffraction ͓Fig. 1͑b͔͒ along with the in situ reflection high-energy electron diffraction ͓Fig. 1͑c͔͒ indicate the presence of sharp interfaces with roughness less than 1 unit cell. The topography image performed using atomic force microscopy ͓Fig. 1͑d͔͒ confirms the surface roughness to be less than 1 un...