Strain-induced switching of heat current direction generated by magneto-thermoelectric effects

Shinya Ota, Ken ichi Uchida, Ryo Iguchi, Pham Van Thach, Hiroyuki Awano, Daichi Chiba

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Since the charge current plays a major role in information processing and Joule heating is inevitable in electronic devices, thermal management, i.e., designing heat flows, is required. Here, we report that strain application can change a direction of a heat current generated by magneto-thermoelectric effects. For demonstration, we used metallic magnets in a thin-film form, wherein the anomalous Ettingshausen effect mainly determines the direction of the heat flow. Strain application can alter the magnetization direction owing to the magnetoelastic effect. As a result, the heat current, which is in the direction of the cross product of the charge current and the magnetization vector, can be switched or rotated simply by applying a tensile strain to the metallic magnets. We demonstrate 180° switching and 90° rotation of the heat currents in an in-plane magnetized Ni sample on a rigid sapphire substrate and a perpendicularly magnetized TbFeCo film on a flexible substrate, respectively. An active thermography technique was used to capture the strain-induced change in the heat current direction. The method presented here provides a novel method for controlling thermal energy in electronic devices.

Original languageEnglish
Article number13197
JournalScientific reports
Issue number1
Publication statusPublished - 2019 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • General


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