Electrical transport properties in Fe-Cr nanocluster-assembled granular films

•Fe-Cr nanocluster-assembled granular films were successfully prepared by a novel in situ assembly technology.•Conduction mechanism in Fe-Cr granular films was proposed.•Scattering effect contribution to resistivity in granular films was extract.•Anomalous Hall effect scaling relation in Fe-Cr granu...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2017-09, Vol.438, p.185-192
Main Authors: Wang, Xiong-Zhi, Wang, Lai-Sen, Zhang, Qin-Fu, Liu, Xiang, Xie, Jia, Su, A-Mei, Zheng, Hong-Fei, Peng, Dong-Liang
Format: Article
Language:English
Subjects:
Anomalous Hall effect
Atomic structure
Core-shell structure
Deposition
Electrical resistivity
Electrical transport property
Electromagnetism
Hall effect
Iron
Magnetoresistance
Magnetoresistivity
Nanocluster-assembled granular films
Nanoclusters
Scaling
Shunt resistance
Studies
Transmission electron microscopy
Transport properties
Variation
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Summary:•Fe-Cr nanocluster-assembled granular films were successfully prepared by a novel in situ assembly technology.•Conduction mechanism in Fe-Cr granular films was proposed.•Scattering effect contribution to resistivity in granular films was extract.•Anomalous Hall effect scaling relation in Fe-Cr granular films was studied.•The magnetoresistance effect in Fe-Cr granular films was investigated. The Fe100-xCrx nanocluster-assembled granular films with Cr atomic fraction (x) ranging from 0 to 100 were fabricated by using a plasma-gas-condensation cluster deposition system. The TEM characterization revealed that the uniform Fe clusters were coated with a Cr layer to form a Fe-Cr core-shell structure. Then, the as-prepared Fe100-xCrx nanoclusters were randomly assembled into a granular film in vacuum environments with increasing the deposition time. Because of the competition between interfacial resistance and shunting effect of Cr layer, the room temperature resistivity of the Fe100-xCrx nanocluster-assembled granular films first increased and then decreased with increasing the Cr atomic fraction (x), and revealed a maximum of 2×104μΩ cm at x=26 at.%. The temperature-dependent longitudinal resistivity (ρxx), magnetoresistance (MR) effect and anomalous Hall effect (AHE) of these Fe100-xCrx nanocluster-assembled granular films were also studied systematically. As the x increased from 0 to 100, the ρxx of all samples firstly decreased and then increased with increasing the measuring temperature. The dependence of ρxx on temperature could be well addressed by a mechanism incorporated for the fluctuation-induced-tunneling (FIT) conduction process and temperature-dependent scattering effect. It was found that the anomalous Hall effect (AHE) had no legible scaling relation in Fe100-xCrx nanocluster-assembled granular films. However, after deducting the contribution of tunneling effect, the scaling relation was unambiguous. Additionally, the Fe100-xCrx nanocluster-assembled granular films revealed a small negative magnetoresistance (MR), which decreased with the increase of x. The detailed physical mechanism of the electrical transport properties in these Fe100-xCrx nanocluster-assembled granular films was also studied.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2017.04.076