Nanowerk May 18, 2021
Widespread use of the 2.4GHz radio frequency that uses WiFi has made excess signals available to be tapped for alternative uses. An international team of researchers (Singapore, India, Japan) has demonstrated electrical synchronization of four non-vortex uniformly magnetized spin-torque oscillators (STOs) using a single common current source in both parallel and series configurations at 2.4 GHz band, resolving the frequency-area quandary for designing STO based on-chip communication systems. The synchronized STOs showed an excellent time-domain stability and substantially improved phase noise performance. By integrating the electrically connected eight STOs, they demonstrated the battery-free energy-harvesting system utilizing the wireless radio-frequency energy to power electronic devices such as LEDs. The results highlight the significance of electrical topology (series vs. parallel) while designing an on-chip STOs system…read more. Open Access TECHNICAL ARTICLE
Output frequency and power of the four synchronized STOs. Credit: Nature Communications volume 12, Article number: 2924 (2021)Â