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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Inhomogeneity effects on magnetic and magnetotransport properties of CoxCu100-x films produced by ultrashort pulsed laser deposition
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Inhomogeneity effects on magnetic and magnetotransport properties of CoxCu100-x films produced by ultrashort pulsed laser deposition

机译：不均匀性对超短脉冲激光沉积产生的CoxCu100-x薄膜的磁和磁输运性能的影响

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摘要

Films produced by means of ultrashort pulsed laser deposition (uPLD) and constituted of Co nanoparticles (NPs) mixed with Cu ones exhibit peculiar morphological and topological properties. In particular, the NPs obtained by uPLD retain their individuality with a moderate coalescence which permits interparticle discontinuities. Due to this condition, the NP interface contributes significantly to the electron transport mechanisms depending on the magnetizing field. As a consequence, magnetoresistance effects are evidenced which do not saturate up to external magnetizing fields much higher than the value required for the saturation of the macroscopic magnetization. Moreover, when the cobalt volume fraction (x) is lower than 35%, the set of magnetic, resistive and magnetoresistive data shows that the magnetic percolation among the Co particles is not completely obtained and a transport mechanism of the giant magnetoresistance (GMR) kind is active in the uPLD films, notwithstanding the fact that the average particle size is higher in comparison with that expected for GMR optimization. On the other hand, if the contact among Co particles is obtained (x >= 50%) the anisotropic magnetoresistance (AMR) becomes the prominent effect. In this circumstance, the presence of interparticle discontinuities is still deducible by the experimental evidence of a negative derivative of the magnetoresistance ratio versus the applied magnetic field. In the same x range (x >= 50%), the AMR increases with the Co content, while zero field resistivity does not change.
机译：通过超短脉冲激光沉积（uPLD）制成并由Co纳米颗粒（NPs）与Cu混合而成的薄膜具有独特的形态和拓扑特性。尤其是，通过uPLD获得的NP保留了其个体性，并具有适度的聚结能力，从而允许颗粒间不连续。由于这种情况，取决于磁化场，NP界面对电子传输机制有很大贡献。结果，证明了磁阻效应不会饱和到比宏观磁化饱和所需的值高得多的外部磁化场。此外，当钴的体积分数（x）低于35％时，一组磁，电阻和磁阻数据表明未完全获得Co颗粒之间的磁渗透，并且是巨磁电阻（GMR）类的传输机制尽管平均粒径比预期的GMR优化要高，但在uPLD膜中仍具有活性。另一方面，如果获得Co颗粒之间的接触（x＞ ＝ 50％），则各向异性磁阻（AMR）成为显着的效果。在这种情况下，仍然可以通过磁阻比与外加磁场的负导数的实验证据来推断粒子间不连续的存在。在相同的x范围内（x> = 50％），AMR随着Co含量的增加而增加，而零场电阻率不变。

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