Effect of in situ low-temperature annealing on anomalous Hall effect in Co nanocluster-assembled granular film
Effect of in situ low-temperature annealing on anomalous Hall effect in Co nanocluster-assembled granular film
复制标题
原位低温退火对Co纳米团簇颗粒薄膜反常霍尔效应的影响
DOI：
10.1016/j.jallcom.2018.03.215
复制
发表时间：
2018-06-05
影响因子：
6.2
通讯作者：
Peng, D. L.
中科院分区：
文献类型：
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作者：
Zhang, Q. F.;Wang, L. S.;Peng, D. L.
采用等离子体气相冷凝法制备了Co纳米团簇组装膜。随后，在真空中在相对低的温度下对样品进行原位退火。利用物理性质测量系统（PPMS）系统研究了退火温度对Co纳米团簇组装颗粒膜电输运行为的影响。通过这种方法，我们成功地实现了Co团簇的表面和界面发生了轻微的变化，但团簇的大小几乎是一个常数。我们发现，在相邻的Co团簇之间的界面处的势垒降低退火温度的增加，由于在界面和表面的原子无序度的下降。随着退火温度的升高，薄膜的剩余电阻率和饱和反常霍尔电阻率单调增加。此外，还研究了5K下反常霍尔电导率与剩余纵向电导率之间的标度关系。该标度关系与1.6标度关系在坏金属区的普适性一致。该方法为研究微结构转变对颗粒膜电输运行为的影响提供了一种简单有效的方法。此外，我们的研究结果将为理解磁性颗粒膜中表面和界面散射对AHE的影响提供实验依据。(C)2018 Elsevier B.V.版权所有。
The Co nanocluster-assembled film was prepared by using a plasma-gas-condensation method. Subsequently, the sample was in-situ annealed in a vacuum at relatively low temperature. The effect of annealing temperature on electrical transport behaviors of Co nanocluster-assembled granular film were systematically investigated by a Physical Property Measurement System (PPMS). By this method, we successfully realized that the surface and interface of the Co cluster were slightly transformed but the cluster size was almost a constant. We discovered that the potential barrier at the interface between adjacent Co clusters decreased with increasing annealing temperature due to the decrease in the degree of atomic disorder at interface and surface. Meanwhile, the residual resistivity and saturated anomalous Hall resistivity increased monotonously as the annealing temperature increased. Furthermore, the scaling relation between anomalous Hall conductivity and residual longitudinal conductivity at 5 K was studied. The scaling relation agreed well with the universal character of the 1.6 scaling relation in the bad metal regime. This method provided a simple and effective way to study the effect of the microstructural transformation on electrical transport behavior in the granular film. Additionally, our results would provide an experimental basis for shining light on understanding of how the surface and interfacial scattering affected the AHE in magnetic granular film. (C) 2018 Elsevier B.V. All rights reserved.