Flexible heat-flow sensing sheets based on the longitudinal spin Seebeck effect using one-dimensional spin-current conducting films

TL;DR

This paper presents a flexible thermoelectric sheet utilizing the longitudinal spin Seebeck effect with a novel one-dimensional spin-current conducting film, enabling bendable heat-flow sensing applications.

Contribution

It introduces a flexible LSSE-based thermoelectric sheet with a ferrite-plated NiZnFeO film, demonstrating a new approach for bendable heat-flow sensors.

Findings

The ferrite-plated film acts as a one-dimensional spin-current conductor.

The flexible sheet effectively detects heat flow in bending conditions.

The film's columnar crystal structure enhances spin-current conduction.

Abstract

We demonstrated a flexible thermoelectric (TE) sheet based on the longitudinal spin Seebeck effect (LSSE) that is especially suitable for heat-flow sensing applications. This TE sheet contained a Ni0.2Zn0.3Fe2.5O4 film which was formed on a flexible plastic sheet using a spray-coating method known as ferrite plating. The experimental results suggest that the ferrite-plated film, which has a columnar crystal structure aligned perpendicular to the film plane, functions as a unique one-dimensional spin-current conductor suitable for bendable LSSE-based sensors.