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Enhanced anomalous Hall effect in Fe nanocluster assembled thin films
Junbao Wang1, Wenbo Mi, Laisen Wang
1Department of Materials Science and Engineering, College of Materials, Fujian Key Laboratory of Advanced Materials, Xiamen University, Xiamen 361005, P. R. China. dlpeng@xmu.edu.cn.
Physical Chemistry Chemical Physics : PCCP
|July 5, 2014
Summary
Heterogeneous iron (Fe) cluster films exhibit a significantly enhanced anomalous Hall effect, with Hall resistivity showing a unique temperature dependence and a novel scaling relationship. This discovery offers new insights into the anomalous Hall effect in magnetic nanostructures.
Area of Science:
- Condensed matter physics
- Materials science
- Nanotechnology
Background:
- The anomalous Hall effect (AHE) is a fundamental phenomenon in magnetic materials, crucial for spintronic applications.
- Understanding AHE in nanostructured materials is key to developing novel electronic devices.
- Previous studies on AHE in iron (Fe) have primarily focused on bulk or continuous thin films.
Purpose of the Study:
- To investigate the anomalous Hall effect in heterogeneous uniform Fe cluster assembled films.
- To explore the influence of film thickness on AHE properties.
- To analyze the temperature dependence and scaling behavior of Hall resistivity.
Main Methods:
- Fabrication of Fe cluster assembled films with varying thicknesses (160-1200 nm) using plasma-gas-condensation.
- Measurement of Hall resistivity and longitudinal resistivity at different temperatures.
- Analysis of the anomalous Hall coefficient (Rs) and saturated Hall resistivity (ρ(A)xy).
Main Results:
- Observed an enhanced anomalous Hall effect in Fe cluster films, with Rs reaching 2.4 × 10(-8) Ω cm G(-1) at 1200 nm thickness and 300 K.
- The maximum Rs is nearly four orders of magnitude larger than that of bulk Fe.
- Saturated Hall resistivity exhibited a temperature-dependent increase followed by a decrease, with a sign change from positive to negative.
- A new scaling relation, log(ρ(A)xy/ρxx) = a0 + b0 log ρxx, was identified, showing ρ(A)xy decreases with increasing ρxx.
Conclusions:
- Heterogeneous Fe cluster films demonstrate a significantly enhanced anomalous Hall effect compared to bulk Fe.
- The observed temperature dependence and scaling relation provide new insights into the mechanisms governing AHE in nanostructured magnetic materials.
- These findings could pave the way for advanced spintronic devices utilizing tailored magnetic nanostructures.
