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首页> 外文期刊>Nanotechnology >Measurement of the giant magnetoresistance effect in cobalt-silver magnetic nanostructures: Nanoparticles
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Measurement of the giant magnetoresistance effect in cobalt-silver magnetic nanostructures: Nanoparticles

机译：钴银磁性纳米结构中巨磁阻效应的测量：纳米颗粒

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摘要

Cobalt-silver (Co-Ag) core-shell nanoparticles with different silver thicknesses were prepared by the microemulsion method in a two-step reduction process. Transmission electron microscopy (TEM) characterization revealed the almost monodispersity and nanometric size (in the range 3-5nm depending on the shell thickness) of the synthesized nanoparticles. However, it was the use of high-resolution TEM that revealed the correct core-shell formation of the nanometric material. The selected area electron diffraction pattern indicated the fcc (face-centered cubic) and hcp (hexagonal close packed) nature for silver and cobalt, respectively. Cyclic voltammetry also allowed the correct core-shell formation to be assured. The magnetic properties revealed the presence of both superparamagnetic and ferromagnetic contributions. Because of the lack of methodology, it was necessary to develop a method to measure the magnetotransport properties of the prepared nanoparticles. The strategy which followed was successful as it was possible to measure these properties: giant magnetoresistance values of 0.1% at room temperature were obtained. The numerical analysis of magnetic and magnetoresistance data indicated the presence of superparamagnetic particles showing interaction among the magnetic moments.
机译：通过微乳液法在两步还原过程中制备了具有不同银厚度的钴银（Co-Ag）核壳纳米粒子。透射电子显微镜（TEM）表征显示了合成纳米颗粒的几乎单分散性和纳米级尺寸（在3-5nm范围内，具体取决于壳层厚度）。但是，正是使用高分辨率TEM揭示了纳米材料的正确核壳形成。所选区域的电子衍射图分别显示了银和钴的fcc（面心立方）和hcp（六方密堆积）性质。循环伏安法还可以确保正确的核-壳形成。磁性表明存在超顺磁性和铁磁性。由于缺乏方法学，因此有必要开发一种方法来测量制备的纳米颗粒的磁迁移性质。随后的策略是成功的，因为可以测量这些属性：在室温下获得0.1％的巨磁阻值。磁和磁阻数据的数值分析表明，超顺磁性粒子的存在表明了磁矩之间的相互作用。

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