4.7 Article

Magneto-optical design of anomalous Nernst thermopile

Journal

SCIENTIFIC REPORTS
Volume 11, Issue 1, Pages -

Publisher

NATURE RESEARCH
DOI: 10.1038/s41598-021-90865-5

Keywords

-

Funding

  1. CREST Creation of Innovative Core Technologies for Nano-enabled Thermal Management from JST, Japan [JPMJCR17I1]
  2. JSPS KAKENHI, Japan [18H05246, 18H03787]
  3. NEC Corporation
  4. ICYS Research Fellowship, NIMS, Japan
  5. JSPS [18J02115]
  6. Grants-in-Aid for Scientific Research [18H03787, 18J02115, 18H05246] Funding Source: KAKEN

Ask authors/readers for more resources

The study demonstrates a thermoelectric generation method based on the anomalous Nernst effect, which is significantly enhanced in terms of thermoelectric output and structure by combining with magneto-optical recording technique. This research will help simplify device structures and promote effective utilization in thermoelectric applications.
The introduction of spin caloritronics into thermoelectric conversion has paved a new path for versatile energy harvesting and heat sensing technologies. In particular, thermoelectric generation based on the anomalous Nernst effect (ANE) is an appealing approach as it shows considerable potential to realize efficient, large-area, and flexible use of heat energy. To make ANE applications viable, not only the improvement of thermoelectric performance but also the simplification of device structures is essential. Here, we demonstrate the construction of an anomalous Nernst thermopile with a substantially enhanced thermoelectric output and simple structure comprising a single ferromagnetic material. These improvements are achieved by combining the ANE with the magneto-optical recording technique called all-optical helicity-dependent switching of magnetization. Our thermopile consists only of Co/Pt multilayer wires arranged in a zigzag configuration, which simplifies microfabrication processes. When the out-of-plane magnetization of the neighboring wires is reversed alternately by local illumination with circularly polarized light, the ANE-induced voltage in the thermopile shows an order of magnitude enhancement, confirming the concept of a magneto-optically designed anomalous Nernst thermopile. The sign of the enhanced ANE-induced voltage can be controlled reversibly by changing the light polarization. The engineering concept demonstrated here promotes effective utilization of the characteristics of the ANE and will contribute to realizing its thermoelectric applications.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available