Terahertz Pump Pulse (IMAGE) American Institute of Physics Caption A terahertz pump pulse is focused on the surface of a semiconductor sample embedded with ferromagnetic nanoparticles, and a probe pulse detects the 'excited' dynamics. A large modulation of up to 20 percent of the magnetization was observed with terahertz pump pulse irradiation. Credit Ohya Laboratory Usage Restrictions Journalists may use this image only with appropriate credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.