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Related Experiment Video

Updated: May 26, 2026

Characterization of Thermal Transport in One-dimensional Solid Materials

Characterization of Thermal Transport in One-dimensional Solid Materials

Published on: January 26, 2014

Intrinsic spin-dependent thermal transport.

S Y Huang¹, W G Wang, S F Lee

¹Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA. ssuyenhuang@gmail.com

Physical Review Letters

|December 21, 2011

Summary

Substrates significantly alter spin-dependent thermal transport in thin films, causing unexpected asymmetric effects. Substrate-free studies reveal intrinsic spin caloritronic properties, similar to anisotropic magnetoresistance.

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Area of Science:

Condensed matter physics
Spintronics
Thermal transport phenomena

Background:

Spin caloritronic effects, such as the spin-Seebeck effect, are typically studied using thin films on substrates.
The influence of substrates on spin-dependent thermal transport remains a critical factor to understand.

Purpose of the Study:

To investigate the profound effect of substrates on spin-dependent thermal transport in patterned ferromagnetic thin films.
To differentiate between substrate-influenced and intrinsic spin caloritronic transport.

Main Methods:

Fabrication of patterned ferromagnetic thin films.
Application of controlled temperature gradients (longitudinal and transverse).
Measurement of thermal voltages and analysis of spin dependence.

Main Results:

Observed asymmetric spin dependence in both longitudinal and transverse thermal voltages, contrary to expected symmetric behavior.
Identified out-of-plane temperature gradients and mixed anomalous Nernst effects as causes for substrate-induced asymmetry.
Demonstrated substrate-free samples exhibiting intrinsic spin-dependent thermal transport.

Conclusions:

Substrates significantly impact and can mask intrinsic spin caloritronic effects.
Understanding substrate effects is crucial for accurate characterization of spin-dependent thermal transport.
Substrate-free investigations are essential for revealing intrinsic spin caloritronic properties comparable to anisotropic magnetoresistance.