Microstructure, Magnetic, and Magnetoresistance Properties of La0.7Sr0.3MnO3:CuO Nanocomposite Thin Films

Fan, Meng; Wang, Han; Misra, S. C. K.; Zhang, Bruce; Qi, Zhimin; Sun, Xing; Wang, Haiyan

doi:10.1021/acsami.7b17398

Cited by 26 publications

(16 citation statements)

References 32 publications

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“…Using the self-assembled Au-BTO film (with ≈10 nm Au pillar diameter) as the buffer layer helps overcome the resolution limitation of the conventional VLS mechanism, that relies on direct Au deposition to control the formation of equilibrium Au clusters or the optical lithography resolution by patterning the substrate with Au structures for ordered ZnO NW growth. It is clear that this complex system combines magnetoresistive [42] and hyperbolic properties enabled by the novel growth approach. Besides the ferroelectric properties and nonlinear and anisotropic optical properties, these ordered www.advmat.de www.advancedsciencenews.com three-phase materials could find applications in photocatalyst designs, gas sensors, high density magnetic storage and spintronic devices, by combining magnetic, electrical, and optical properties of three phases.…”

Section: Nanocompositesmentioning

confidence: 99%

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Self‐Assembled Ordered Three‐Phase Au–BaTiO₃–ZnO Vertically Aligned Nanocomposites Achieved by a Templating Method

Misra

Zhang

et al. 2018

Advanced Materials

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spintronics, [2] multiferroics, [3] and quantum systems. [4] Several two-phase nanocomposite systems, exhibiting multilayer or nanowire morphology, have been demonstrated for achieving enhanced physical properties, including ferroelectricity, [5] ferromagnetism, [6] magnetoresistance, [7] and exotic optical properties such as optical magnetism, [8] negative refraction, [9] and hyperbolic dispersion. [10] For example, hyperbolic metamaterials with ordered and anisotropic metal-dielectric nanocomposite designs support the propagation of high wavevectors. [11] Since very few hyperbolic materials exist naturally, this artificially engineered nanocomposite approach provides a multifunctional platform to realize such materials with applications in subdiffraction imaging, [12] sensing, [13] waveguiding, [14] and also offers an opportunity to achieve coupled electric, magnetic, and optical responses. However, due to the availability of a limited range of structures in terms of crystallinity and morphology, a greater design flexibility and a structural complexity along with versatile growth techniques are needed for developing next generation integrated photonic and electronic devices. This can be achieved by incorporating a third phase through the three-phase nanocomposite designs by judicious selection of materials and functionalities.Besides material selection, the spatial ordering of the phases has great impacts on the overall functionalities of nanocomposite materials. Previous efforts to grow ordered ceramicmetal nanocomposites have focused on applying patterning techniques such as anodized alumina oxide (AAO) templates, [15] e-beam lithography, [16] focused ion beam (FIB), [17] and substrate nanotemplate. [18] In contrast, a self-assembly approach for fabricating such ordered oxide-metal nanocomposites is costeffective and overcomes the resolution limitation and complex fabrication steps. Controlled synthesis of such self-assembled complex hybrid nanostructures with desired ordering and epitaxial quality remains a challenge. Specifically, large difference in surface energy, growth kinetics, and high tendency of oxidation and interdiffusion between vastly different phases remains as a major challenge and imposes difficulties in ordering control. Despite the recent success of the self-assembled epitaxial Complex multiphase nanocomposite designs present enormous opportunities for developing next-generation integrated photonic and electronic devices. Here, a unique three-phase nanostructure combining a ferroelectric BaTiO 3 , a wide-bandgap semiconductor of ZnO, and a plasmonic metal of Au toward multifunctionalities is demonstrated. By a novel two-step templated growth, a highly ordered Au-BaTiO 3 -ZnO nanocomposite in a unique "nanoman"-like form, i.e., self-assembled ZnO nanopillars and Au nanopillars in a BaTiO 3 matrix, is realized, and is very different from the random three-phase ones with randomly arranged Au nanoparticles and ZnO nanopillars in the BaTiO 3 matrix. The ordered three-phase "nanoman"-like structu...

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Section: Nanocompositesmentioning

confidence: 99%

“…As a demonstration, a successful growth of another multiphase nanocomposite of Au-BTO/ LSMO-CuO system has been demonstrated via the VLS and template method as shown in Figure S12 (Supporting Information). It is clear that this complex system combines magnetoresistive [42] and hyperbolic properties enabled by the novel growth approach.…”

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confidence: 99%

Self‐Assembled Ordered Three‐Phase Au–BaTiO₃–ZnO Vertically Aligned Nanocomposites Achieved by a Templating Method

Misra

Zhang

et al. 2018

Advanced Materials

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“…The MR value was calculated according to the equation below

MR (%) = \frac{R_{0} - R_{H}}{R_{0}} \times 100 %

where R 0 and R H represent the resistances collected under zero magnetic field and the magnetic field of 1 T perpendicular to the film surface, respectively. [ 2,6,22,38 ]…”

Section: Methodsmentioning

confidence: 99%

“…[ 34,35 ] The enhanced resistance leads to a decreased T MI , which agrees well with the previous reports. [ 24,35–39 ] The temperature dependence of magnetoresistance (MR%‐T) curves of Figure 4c is generated according to the R‐T curves in Figure 4a. The maximum MR% (MR peak ) value and its position ( T peak ) of each framework could be tuned by varying the interlayer M. The MR peak value of each 3D framework is gradually reduced from ≈36.7% to ≈20.8% by varying from YSZ to MgO and the YSZ interlayer sample presents the optimized MR properties (Figure 4d).…”

Section: Figurementioning

confidence: 99%

Role of Interlayer in 3D Vertically Aligned Nanocomposite Frameworks with Tunable Magnetotransport Properties

Sun

Kalaswad

et al. 2020

Adv Materials Inter

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Very recently, a 3D framework design integrating complex VAN structures has drawn great research interest. [2,6,21,22] The 3D framework is generated by integrating the multilayer and VAN designs together-numerous vertical nanopillars connect with the lateral interlayers to form a 3D interconnected frame embedded in the matrix. This 3D framework design combines the lateral and vertical strain engineering within the film, exhibits both advantages of the multilayer and VAN designs, and achieves an unprecedented degree of control of the film strain and properties. [6,22] The 3D framework thin films were first demonstrated in La 0.7 Sr 0.3 MnO 3 (LSMO)-CeO 2 systems by inserting one to three layers of CeO 2 (or LSMO) interlayers into the LSMO-CeO 2 VAN counterparts and forming 3D CeO 2 (or LSMO) frameworks. [6] Later, the feasibility of this 3D framework concept was demonstrated in LSMO-ZnO system along with a study on the effect of the ZnO interlayer thickness, which was controlled from 0 to ≈10 nm and effectively tuned the magnetotransport performance of the 3D framework films. [22] The overall framework (i.e., the secondary interlayers) embedded in all the reported 3D thin films is homogeneous, such as CeO 2 , LSMO, and ZnO. [6,21,22] Studies on heterogeneous interlayers are still rare. Moreover, the interlayer and its interplay with the matrix material are crucial for the 3D frameworks, since the 3D frames consist of vertical nanopillars and lateral interlayers.To achieve a precise control on the 3D framework structures, understanding the role of the interlayer within the 3D framework is significant and necessary.In this work, a set of 3D framework thin films have been processed by inserting different lateral interlayers (M). These interlayers present different in-plane matching distances from LSMO as illustrated in Figure 1a. The interlayer M candidates are yttria-stabilized zirconia (YSZ, 8 mol% Y 2 O 3 + 92 mol% ZrO 2 ), CeO 2 , SrTiO 3 (STO), BaTiO 3 (BTO), and MgO. In the resulting 3D structures, all ZnO nanopillars connect with the lateral interlayer M and create a 3D heterogeneous frame embedded in the LSMO matrix. The role of the lateral interlayer in determining the 3D heterogeneous framework microstructure and magnetotransport properties is systematically studied. The aforementioned interlayer materials are selected for the following reasons: 1) the in-plane lattice matching To investigate the role of interlayers on the growth, microstructure, and physical properties of 3D nanocomposite frameworks, a set of novel 3D vertically aligned nanocomposite (VAN) frameworks are assembled by a relatively thin interlayer (M) sandwiched by two consecutively grown La 0.7 Sr 0.3 MnO 3 (LSMO)-ZnO VANs layers. ZnO nanopillars from the two VAN layers and the interlayer (M) create a heterogeneous 3D frame embedded in the LSMO matrix. The interlayer (M) includes yttria-stabilized zirconia (YSZ), CeO 2 , SrTiO 3 , BaTiO 3 , and MgO with in-plane matching distances increasing from ≈3.63 to ≈4.21 Å, and expected in-plane stra...

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“…5a. Previous studies on LSMO films grown on dissimilar substrates have reported ZFC curves exhibiting a FM behavior with Curie temperatures between 330 K to 560 K for thin films [5][6][7]24 and 370 K for bulk samples 25 ; but recently, studies on LSMO:CuO nanocomposite films have reported T C values around 220 K and 250 K 26 . The lower value of 218 K here obtained could be correlated with the in-plane misorientation and the inter-nanoregions disordered phase boundaries with random in-plane orientations inherited from the two-dimensional Si-O-Si array at the surface of the native amorphous where the LSMO thin film grew.…”

Section: Magnetic Characterization Figures 5ac Show the In-plane M(mentioning

confidence: 99%

Superparamagnetic state in La0.7Sr0.3MnO3 thin films obtained by rf-sputtering

Camacho

Sánchez-Valdés

Curiel

et al. 2020

Sci Rep

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A novel superparamagnetic state has been observed in high quality La 0.7 Sr 0.3 Mno 3 (LSMO) thin films directly grown by rf-sputtering on SiO x /Si(100) substrates. The films are nanostructured without grain boundaries, constituted by locally epitaxial nanoregions grown layer-by-layer with out-of-plane (012) preferential orientation, induced by the constrain of the native silicon oxide. Low magnetic field ZFC-FC magnetization curves show a cross-over from superparamagnetic to ferromagnetic state dependent of the thickness. The thicker film (140 nm) exhibits typical ferromagnetic order. The thinner films (40 and 60 nm) exhibit superparamagnetic behavior attributed to interacting ferromagnetic monodomain nanoregions with critical size, random in-plane oriented, where the inter-monodomain boundaries with surface spin-glass structure regulate the blocking of magnetization depending on the magnetic field intensity. M(H) hysteresis loops showed noticeable coercive fields in all samples, larger than those reported for LSMO. Such properties of half-metal LSMO film foresee potential integration in new Sitechnology nanodevices in Spintronics.

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Microstructure, Magnetic, and Magnetoresistance Properties of La_0.7Sr_0.3MnO₃:CuO Nanocomposite Thin Films

Cited by 26 publications

References 32 publications

Self‐Assembled Ordered Three‐Phase Au–BaTiO₃–ZnO Vertically Aligned Nanocomposites Achieved by a Templating Method

Self‐Assembled Ordered Three‐Phase Au–BaTiO₃–ZnO Vertically Aligned Nanocomposites Achieved by a Templating Method

Role of Interlayer in 3D Vertically Aligned Nanocomposite Frameworks with Tunable Magnetotransport Properties

Superparamagnetic state in La0.7Sr0.3MnO3 thin films obtained by rf-sputtering

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Microstructure, Magnetic, and Magnetoresistance Properties of La0.7Sr0.3MnO3:CuO Nanocomposite Thin Films

Cited by 26 publications

References 32 publications

Self‐Assembled Ordered Three‐Phase Au–BaTiO3–ZnO Vertically Aligned Nanocomposites Achieved by a Templating Method

Self‐Assembled Ordered Three‐Phase Au–BaTiO3–ZnO Vertically Aligned Nanocomposites Achieved by a Templating Method

Role of Interlayer in 3D Vertically Aligned Nanocomposite Frameworks with Tunable Magnetotransport Properties

Superparamagnetic state in La0.7Sr0.3MnO3 thin films obtained by rf-sputtering

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Microstructure, Magnetic, and Magnetoresistance Properties of La_0.7Sr_0.3MnO₃:CuO Nanocomposite Thin Films

Self‐Assembled Ordered Three‐Phase Au–BaTiO₃–ZnO Vertically Aligned Nanocomposites Achieved by a Templating Method

Self‐Assembled Ordered Three‐Phase Au–BaTiO₃–ZnO Vertically Aligned Nanocomposites Achieved by a Templating Method