Electrically connected spin-torque oscillators array for 2.4 GHz WiFi band transmission and energy harvesting

Journal: Nature Communications

Published: 2021-05-18

DOI: 10.1038/s41467-021-23181-1

Affiliations: 7

Authors: 8

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Research Highlight

WiFi-powered device demonstrated

© Andriy Onufriyenko/Moment/Getty Images

© Andriy Onufriyenko/Moment/Getty Images

A spintronics device can harvest energy from ubiquitous WiFi signals and use it light up a light-emitting diode (LED).

WiFi seems to be everywhere these days, but when it’s not being used to connect to the internet, its energy is wasted.

Now, a team led by researchers at the National University of Singapore has created a device based on an array of tiny microwave oscillators known as spin-torque oscillators that can collect the energy from wireless radio frequencies such as WiFi signals.

The team demonstrated the potential of their device by using it to charge a capacitor for 5 seconds and then using the capacitor to power a 1.6-volt LED for a minute.

The secret to their success lay in synchronizing the outputs of the spin-torque oscillators by electrically connecting them in series.

The team is now looking into increase the number of spin-torque oscillators in the array.

Supported content

  1. Nature Communications 12, 2924 (2021). doi: 10.1038/s41467-021-23181-1
Institutions Share
National University of Singapore (NUS), Singapore 0.56
Tohoku University, Japan 0.29
Center for Spintronics Research Network (CSRN) - Tohoku University, Japan 0.08
Indian Institute of Technology Delhi (IIT Delhi), India 0.06