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首页> 外文期刊>RSC Advances >Magnetic anisotropy induced in NiCo granular nanostructures by ZnO nanorods deposited on a polymer substrate
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Magnetic anisotropy induced in NiCo granular nanostructures by ZnO nanorods deposited on a polymer substrate

机译：沉积在聚合物基质上的ZnO纳米棒在NiCo颗粒纳米结构中诱导的磁各向异性

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摘要

Hetero-nanostructures made of NiCo and ZnO nanostructures have been deposited on a polymer substrate through a two-step method. First a ZnO nanorod array was grown on polydimethylsiloxane (PDMS) substrate by a hydrothermal method. NiCo granular nanostructures were then deposited on the ZnO nanorod array through an electroless polyol process with precursors of Ni complex and Co complex in a mole ratio of 50 : 50. The effect of deposition time (t) on the structure and properties of the hetero-nanostructures has been studied. Ni-rich nanostructures are observed when t < 30 min. With t increasing, the atomic ratio (at.%) of Ni to Co approaches 50 : 50. In addition, a magnetic field (10 kOe) was applied on the hetero-nanostructures, which was parallel and perpendicular to the ZnO nanorods. The magnetization (M-s) of the NiCo nanostructures deposited on ZnO nanorods when t = 60 min is measured at 93.4 emu g(-1). The results of magnetic measurements and X-ray absorption near edge structure spectroscopy (XANES) suggest that the slightly lower magnetizations of the hetero-nanostructures may be caused by the oxidation of Co and Ni on the surface of the granular films. The values of squareness ratio (M-r/M-s) of the hetero-nanostructures with t are far below 0.5. Moreover, the coercivity (H-c) value of the hetero-nanostructures measured in the direction perpendicular to the ZnO nanorods is higher than that in the parallel direction. Therefore, the deposited NiCo granular nanostructures are perpendicular to the plane of the PDMS substrate, and show perpendicular magnetic anisotropy. These results clearly demonstrate that the rod-shaped non-magnetic nanomaterials can significantly affect the magnetic anisotropy of the hetero-nanostructures.
机译：由NiCo和ZnO纳米结构制成的异质纳米结构已通过两步法沉积在聚合物基材上。首先，通过水热法在聚二甲基硅氧烷（PDMS）基板上生长ZnO纳米棒阵列。然后，通过化学多元醇工艺将NiCo和Co络合物的前体以50:50的摩尔比将NiCo颗粒纳米结构沉积在ZnO纳米棒阵列上。沉积时间（t）对杂化结构和结构的影响已经研究了纳米结构。当t <30分钟时，观察到富镍纳米结构。随着t的增加，Ni与Co的原子比（原子％）接近50:50。此外，在平行于并垂直于ZnO纳米棒的异质纳米结构上施加了磁场（10 kOe）。当t = 60 min时，沉积在ZnO纳米棒上的NiCo纳米结构的磁化强度（M-s）在93.4 emu g（-1）下测量。磁性测量和近边缘结构光谱（XANES）的X射线吸收的结果表明，异质纳米结构的磁化强度略低可能是由颗粒膜表面上的Co和Ni氧化引起的。具有t的异质纳米结构的矩形比（M-r / M-s）的值远低于0.5。而且，在垂直于ZnO纳米棒的方向上测量的异质纳米结构的矫顽力（H-c）值高于在平行方向上的矫顽力（H-c）值。因此，沉积的NiCo颗粒纳米结构垂直于PDMS衬底的平面，并显示出垂直的磁各向异性。这些结果清楚地表明，棒状非磁性纳米材料可以显着影响异质纳米结构的磁各向异性。

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