Kim Yun Young
Division of Mechanical, Automotive, and Robot Component Engineering, Dong-eui University, Busan 47340, Korea.
Nanomaterials (Basel). 2017 Aug 31;7(9):247. doi: 10.3390/nano7090247.
The thermal conductivity of a nanoscale yttrium iron garnet (Y₃Fe₅O, 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.
在本研究中，使用超快泵浦-探测技术评估了通过溶胶-凝胶法制备的纳米级钇铁石榴石（Y₃Fe₅O，YIG）薄膜的热导率。测量了由飞秒激光脉冲照射引起的250 nm厚YIG薄膜表面的热反射率变化，并使用有限差分法对瞬态热传导方程的数值解与实验数据进行曲线拟合，以提取热性能。结果表明，该薄膜的热导率比通过不同制造技术制备的块状YIG材料的性能高22-83%，这反映了薄膜的微观结构特征和质量。
