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Abstract
Owing to the increasing demand for the improved management of thermal transport in devices, it is necessary to develop an optimal method for the measurement of anisotropic heat conduction. Although several techniques have been used to measure the heat transport in anisotropic materials, the accurate determination of anisotropic thermal conductivity remains a major challenge. In this study, we present time-resolved magneto-optical Kerr effect measurement using a pump–probe technique to investigate the thermal characterization of various materials. A substrate/ferromagnetic metal (FM) structure is prepared, where FM acts as a transducer to detect the thermal transport in substrates of silicon, sapphire, and highly ordered pyrolytic graphite. By performing experiments under various modulation frequencies and laser spot sizes, we determine both in-plane and through-plane thermal conductivities. We also discuss the limitations of measurement and provide useful guidelines to determine the thermal properties of different materials with high accuracy.
Highlights
The advancement in information processing technology and energy harvesting technology often requires an efficient manipulation of heat flow.1–3 understanding thermal transport in materials has become an integral part of the engineering of devices
We demonstrate the efficiency of the TR-MOKE method for the measurement of in-plane thermal conductivity of both isotropic and anisotropic materials
We presented the advantages of the TR-MOKE technique in measuring the thermal conductivity of both isotropic and anisotropic materials
Summary
The advancement in information processing technology and energy harvesting technology often requires an efficient manipulation of heat flow. understanding thermal transport in materials has become an integral part of the engineering of devices. The phase difference between the heating oscillation and temperature oscillation is measured and analyzed by solving the diffusive heat transport.23,24 Both the TDTR and FDTR methods show high accuracy for determining the thermal conductivity of thin film and bulk materials. A high-intensity pump beam creates a periodic heat flux on a surface sample, and a low-intensity probe beam measures the surface temperature via the Kerr rotation. The inclusion of a metal transducer layer is essential for the absorption of thermal energy from pump pulses and the detection of the temperature response of samples, in particular, to measure the through-plane thermal conductivity.. When ΔT is much smaller than the Curie temperature, Δθ is almost linear with respect to ΔT
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