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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

REVEALING THE ANISOTROPIC THERMAL CONDUCTIVITY USING TIME-RESOLVED MAGNETO-OPTICAL KERR EFFECT

Jie Zhu
Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, USA; Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian, Liaoning 116024, China

Dustin M. Lattery
Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, USA

Junyang Chen
Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN 55455, USA

DeLin Zhang
The Ministry of Machinery Industries, China; Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN 55455, USA

Xiaokun Gu
Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, CO 80309, USA

Haechan Park
Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794, USA

Dawei Tang
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China

Mo Li
Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN 55455, USA

Xu Du
Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794, USA

Ronggui Yang
Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309, USA; Materials Science and Engineering Program, University of Colorado, Boulder, CO 80309, USA; Mechanical Engineering Department Massachusetts Institute of Technology Cambridge, MA 02139, USA

Jian-Ping Wang
Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN 55455, USA

Xiaojia Wang
Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, USA; Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN 55455, USA

DOI: 10.1615/IHTC16.cip.023044
pages 2575-2582


MOTS CLÉS: New materials, Nano/Micro scale measurement and simulation, time-resolved magneto-optical Kerr effect, black phosphorus, magnetic transducer

Résumé

Ultrafast thermo-magneto-optical effect upon femtosecond laser excitation, has enabled new capabilities in the thermal characterization of nanomaterials. In this work, we demonstrate time-resolved magneto-optical Kerr effect (TR-MOKE) as an advanced thermal characterization technique for studying the anisotropic thermal properties of materials. The original factors of the MOKE signal are revealed for four magnetic transducers, including TbFe, GdFeCo, Co/Pd, and CoFe/Pt. A figure of merit is proposed to evaluate the performance of magnetic transducers by examining the improvement of the signal-to-noise ratio (SNR) in TR-MOKE measurements. Excellent agreement between experimental TR-MOKE signals and computed figure of merit is achieved for all four magnetic transducers. We observe the best SNR for TR-MOKE measurements with rare-earth transition metal (RE-TM)-based TbFe and GdFeCo transducers. As an example, we conduct TR-MOKE measurements on a model system of single crystalline black phosphorus (BP) flakes using the optimal TbFe transducer. The measured anisotropic thermal conductivity of BP along three primary crystalline directions well corroborates first-principles predictions. Further, we demonstrate that TR-MOKE, compared with the standard time-domain thermoreflectance, offers an enhanced measurement sensitivity to the in-plane thermal conductivity of materials, and meanwhile is immune to other uncertainties in the transducer properties. Thus, the overall uncertainties of TR-MOKE for in-plane thermal measurements can be significantly improved.

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