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Thermal imaging of spin Peltier effect
Shunsuke Daimon1,2, Ryo Iguchi1, Tomosato Hioki1
1Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
Nature Communications
|December 13, 2016
Summary
Researchers visualized the spin Peltier effect using thermal imaging. This effect, driven by spin currents, causes significant temperature changes at magnetic interfaces, exceeding prior estimates.
Area of Science:
- Spintronics
- Condensed Matter Physics
- Thermal Transport
Background:
- The Peltier effect utilizes charge currents to alter junction temperatures, finding applications in electronics.
- The spin Peltier effect, a spin-current analogue, modulates magnetic junction temperatures.
Purpose of the Study:
- To thermally image and visualize the spin Peltier effect.
- To quantify the temperature modulation induced by spin currents in magnetic insulators.
Main Methods:
- Active thermography technique was employed.
- Spin currents were injected from a metal into a magnetic insulator.
Main Results:
- Thermal images revealed localized heat sources due to spin currents.
- Temperature modulation was observed confined to the metal/insulator interface.
- The magnitude of the spin Peltier effect was found to be over ten times larger than previously reported.
Conclusions:
- Direct visualization of the spin Peltier effect is achieved.
- The spin Peltier effect significantly impacts thermal properties at magnetic interfaces.
- This study provides a more accurate understanding of spin-caloritronic phenomena.
