Time-resolved secondary electron microscope with polarization analysis

Magnetization dynamics has drawn a lot of attention in spintronics due to its application in spintonic device. Motion of spin textures or magnetization switching needs a dynamic profile to study the mechanism to improve its characteristics. One of the most difficult parts in magnetization dynamics study is maintaing high spacial resolution with high temporal resolution. We have used exchange-scattering type spin detector in our microscpe and the signal to noise ratio can be reached by at least one order of magnitude larger compared to conventional Mott spin detector or SPLEED type detector. Our set-up so far, shows a temporal resolution of 40 ns and spatial resolution of 10 nm . The main reason is we are using channeltron now, and this time resolution can be reached down to 1 ns if we replace the detector with channel plate. We have shown the motion of magnetic skyrmion (size less than 100 nm) by current pulses.