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Nanomaterials 2017, 7(9), 247; doi:10.3390/nano7090247

Thermal Conductivity of a Nanoscale Yttrium Iron Garnet Thin-Film Prepared by the Sol-Gel Process

Division of Mechanical, Automotive, and Robot Component Engineering, Dong-eui University, Busan 47340, Korea
Received: 23 July 2017 / Revised: 28 August 2017 / Accepted: 29 August 2017 / Published: 31 August 2017
(This article belongs to the Special Issue Sol-Gel Preparation of Nanomaterials)
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Abstract

The thermal conductivity of a nanoscale yttrium iron garnet (Y3Fe5O12, YIG) thin-film prepared by a sol-gel method was evaluated using the ultrafast pump-probe technique in the present study. The thermoreflectance change on the surface of a 250 nm thick YIG film, induced by the irradiation of femtosecond laser pulses, was measured, and curve fitting of a numerical solution for the transient heat conduction equation to the experimental data was performed using the finite difference method in order to extract the thermal property. Results show that the film’s thermal conductivity is 22–83% higher than the properties of bulk YIG materials prepared by different fabrication techniques, reflecting the microstructural characteristics and quality of the film. View Full-Text
Keywords: yttrium iron garnet; thin-film; sol-gel process; thermal conductivity; ultrafast pump-probe technique; materials characterization yttrium iron garnet; thin-film; sol-gel process; thermal conductivity; ultrafast pump-probe technique; materials characterization
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Kim, Y.Y. Thermal Conductivity of a Nanoscale Yttrium Iron Garnet Thin-Film Prepared by the Sol-Gel Process. Nanomaterials 2017, 7, 247.

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