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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Evolution of magnetoresistance mechanisms in granular Co/C films with different conduction regimes
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Evolution of magnetoresistance mechanisms in granular Co/C films with different conduction regimes

机译：不同导电方式的粒状Co / C薄膜磁致电阻机理的演变

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摘要

Co/C granular films with 3-21% Co content are fabricated by facing-target magnetron sputtering. As the Co content increases, the isolated Co particles in the a-C matrix gradually connect with each other, and consequently the electrical transport of the Co/C films changes from insulating to metallic conduction. The insulating samples show spin-dependent negative magnetoresistance (MR), which is related to the alignment of the spins at the interface between Co particles and the carbon matrix. Interfacial spin polarization P_0 is related to the amount of interfacial hybridization, which is influenced by the size of sp~2 carbon clusters in the a-C matrix. Metallic samples show the competition of negative MR and positive linear MR. Negative MR observed at low temperatures is caused by a weak localization effect and is suppressed when the magnetic field is above 15 kOe. Positive linear MR is observed at high fields and high temperatures, and could be explained by quantum electron-electron interaction theory. The magnetotransport properties in the Co/C films are significantly influenced by the configuration of Co particles and, consequently, the conduction regime rather than the size of sp~2 carbon clusters in the a-C matrix.
机译：通过面对靶磁控溅射制备具有3-21％Co含量的Co / C颗粒膜。随着Co含量的增加，a-C基质中分离出的Co颗粒逐渐彼此连接，因此，Co / C膜的电传输从绝缘变为金属导电。绝缘样品显示出自旋相关的负磁阻（MR），这与自旋在Co颗粒和碳基质之间的界面处的排列有关。界面自旋极化P_0与界面杂交的数量有关，这受a-C基质中sp〜2碳簇的大小影响。金属样品显示出负MR和正线性MR的竞争。在低温下观察到的负MR是由弱的局部效应引起的，并且当磁场高于15 kOe时会被抑制。在高场和高温下观察到正线性MR，并且可以用量子电子-电子相互作用理论来解释。 Co / C薄膜中的磁传输特性受Co颗粒的构型影响很大，因此，其传导方式而不是a-C基质中sp〜2碳簇的大小会影响其性能。

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