Research Center for Magnetic and Spintronic Materials

The 216^th Special CMSM seminar

Ultrafast time-resolved magneto-otical imaging of all-optical switching of magnetization and propagation dynamics of optically-excited spin waves

Dr. Yusuke Hashimoto Spin Quantum Rectification Project, ERATO,
Japan Science and Technology Agency, Sendai, Japan/
WPI Advanced Institute for Materials Research,
Tohoku University, Sendai, Japan

Date & Time: 15:30 - 16:30, April 4^th (Mon), 2016.
Place: 7F Small Seminar Room, Sengen

Abstract:

I have developed a new microscope for magnetic systems. Here, I would like to show my recent results on ultrafast time-resolved microscopic imaging of the all-optical switching of magnetization in ferrimagnetic amorphous GdFeCo film and the propagation dynamics of optically-excited spin waves in a garnet film. These phenomena are visualized through magneto-optical images with sub-micrometer spatial resolution and sub-picosecond time-resolution. I would also discuss our project for the development of ultra-energy-saving all-optical magneto-optical memory devices, which has potential to decrease the energy cost for the data storage to 1% as compared to the conventional hard disk drives.

Reference
Y. Hashimoto, et al., Rev. Sci. Instrum. 85, 063702 (2014).