Electrical transport properties in Co nanocluster-assembled granular film

A Co nanocluster-assembled granular film with three-dimensional cross-connection paralleled conductive paths was fabricated by using the plasma-gas-condensation method in a vacuum environment. The temperature-dependent longitudinal resistivity and anomalous Hall effect of this new type granular film...

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Published in:Journal of applied physics 2017-03, Vol.121 (10)
Main Authors: Zhang, Qin-Fu, Wang, Lai-Sen, Wang, Xiong-Zhi, Zheng, Hong-Fei, Liu, Xiang, Xie, Jia, Qiu, Yu-Long, Chen, Yuanzhi, Peng, Dong-Liang
Format: Article
Language:English
Subjects:
Applied physics
Conduction heating
Electrical resistivity
Hall effect
Nanoclusters
Scaling
Single crystals
Temperature dependence
Transport properties
Variation
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cited_by cdi_FETCH-LOGICAL-c257t-bea401d79353977e0ae9b910cc8dcd5a69d9dea18ce066f9382e871ebb0740ea3
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container_issue 10
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container_title Journal of applied physics
container_volume 121
creator Zhang, Qin-Fu
Wang, Lai-Sen
Wang, Xiong-Zhi
Zheng, Hong-Fei
Liu, Xiang
Xie, Jia
Qiu, Yu-Long
Chen, Yuanzhi
Peng, Dong-Liang
description A Co nanocluster-assembled granular film with three-dimensional cross-connection paralleled conductive paths was fabricated by using the plasma-gas-condensation method in a vacuum environment. The temperature-dependent longitudinal resistivity and anomalous Hall effect of this new type granular film were systematically studied. The longitudinal resistivity of the Co nanocluster-assembled granular film first decreased and then increased with increasing measuring temperature, revealing a minimum value at certain temperature, Tmin. In a low temperature region (T
doi_str_mv 10.1063/1.4977957
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The temperature-dependent longitudinal resistivity and anomalous Hall effect of this new type granular film were systematically studied. The longitudinal resistivity of the Co nanocluster-assembled granular film first decreased and then increased with increasing measuring temperature, revealing a minimum value at certain temperature, Tmin. In a low temperature region (T&lt;Tmin), the barrier between adjacent nanoclusters governed the electrical transport process, and the temperature coefficient of resistance (TCR) showed an insulator-type behavior. The thermal fluctuation-induced tunneling conduction progressively increased with increasing temperature, which led to a decrease in the longitudinal resistivity. In a high temperature region, the TCR showed a metallic-type behavior, which was primarily attributed to the temperature-dependent scattering. Different from the longitudinal resistivity behavior, the saturated anomalous Hall resistivity increased monotonically with increasing measuring temperature. The value of the anomalous Hall coefficient (RS) reached 2.3 × 10−9 (Ω cm)/G at 300 K, which was about three orders of magnitude larger than previously reported in blocky single-crystal Co [E. N. Kondorskii, Sov. Phys. JETP 38, 977 (1974)]. Interestingly, the scaling relation (ρxyA∝ρxxγ) between saturated anomalous Hall resistivity (ρxyA) and longitudinal resistivity (ρxx) was divided into two regions by Tmin. However, after excluding the contribution of tunneling, the scaling relation followed the same rule. 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Different from the longitudinal resistivity behavior, the saturated anomalous Hall resistivity increased monotonically with increasing measuring temperature. The value of the anomalous Hall coefficient (RS) reached 2.3 × 10−9 (Ω cm)/G at 300 K, which was about three orders of magnitude larger than previously reported in blocky single-crystal Co [E. N. Kondorskii, Sov. Phys. JETP 38, 977 (1974)]. Interestingly, the scaling relation (ρxyA∝ρxxγ) between saturated anomalous Hall resistivity (ρxyA) and longitudinal resistivity (ρxx) was divided into two regions by Tmin. However, after excluding the contribution of tunneling, the scaling relation followed the same rule. 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Different from the longitudinal resistivity behavior, the saturated anomalous Hall resistivity increased monotonically with increasing measuring temperature. The value of the anomalous Hall coefficient (RS) reached 2.3 × 10−9 (Ω cm)/G at 300 K, which was about three orders of magnitude larger than previously reported in blocky single-crystal Co [E. N. Kondorskii, Sov. Phys. JETP 38, 977 (1974)]. Interestingly, the scaling relation (ρxyA∝ρxxγ) between saturated anomalous Hall resistivity (ρxyA) and longitudinal resistivity (ρxx) was divided into two regions by Tmin. However, after excluding the contribution of tunneling, the scaling relation followed the same rule. The corresponding physical mechanism was also proposed to explain these phenomena.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/1.4977957</doi><orcidid>https://orcid.org/0000-0001-9531-4480</orcidid></addata></record>
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source American Institute of Physics:Jisc Collections:Transitional Journals Agreement 2021-23 (Reading list)
subjects Applied physics
Conduction heating
Electrical resistivity
Hall effect
Nanoclusters
Scaling
Single crystals
Temperature dependence
Transport properties
Variation
title Electrical transport properties in Co nanocluster-assembled granular film
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