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Published on: October 5, 2018
Flexible heat-flow sensing sheets based on the longitudinal spin Seebeck effect using one-dimensional spin-current
Akihiro Kirihara1,2, Koichi Kondo3, Masahiko Ishida1,2
1Smart Energy Research Laboratories, NEC Corporation, Tsukuba, 305-8501, Japan.
Researchers developed a flexible thermoelectric sheet using the longitudinal spin Seebeck effect (LSSE) for advanced heat-flow sensing. This thin, bendable sensor enables non-obstructive heat flux measurements for smart thermal management.
Area of Science:
- Materials Science
- Physics
- Engineering
Background:
- Thermoelectric (TE) conversion, based on the Seebeck effect, is conventionally used for heat-flow sensing.
- Existing TE sensors often lack the flexibility and low thermal resistance required for ubiquitous heat-flow visualization.
- The longitudinal spin Seebeck effect (LSSE) offers potential for thin-film TE devices with favorable characteristics.
Purpose of the Study:
- To demonstrate a novel LSSE-based flexible thermoelectric sheet for heat-flow sensing applications.
- To develop a thin and flexible sensor suitable for non-obstructive heat flux measurements.
- To explore the potential of LSSE for advanced thermal management systems.
Main Methods:
- Fabrication of a Ni0.2Zn0.3Fe2.5O4 film on a flexible plastic sheet using spray-coating (ferrite plating).
- Characterization of the film's structure, including its columnar crystal alignment.
- Experimental validation of the flexible sheet's performance in LSSE-based heat-flow sensing.
Main Results:
- The developed TE sheet exhibits flexibility and suitability for LSSE-based sensing.
- The ferrite-plated film possesses a columnar crystal structure aligned perpendicular to the film plane.
- This structure facilitates one-dimensional spin-current conduction, crucial for bendable LSSE sensors.
Conclusions:
- A novel, thin, and flexible LSSE-based thermoelectric sheet has been successfully developed.
- The unique properties of the ferrite-plated film enable versatile heat-flow measurements without obstructing heat flux.
- This technology paves the way for advanced, non-obstructive heat-flow visualization and smart thermal management.
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