Dr. Koo has been a Senior Researcher of the Nano Device Research Center at The Korea Institute of Science and Technology (KIST) since 2004. He focuses on spin electronics device, which is voltage controlled spin device. Spin-FET is main concern of his research project and he try to realize the world first spin transport transistor operated by external electric field. His other research topic is to develop spin Hall devices. All of devices are fabricated by nano technology such as electron beam lithography. He is also interested in Magnetic Random Access Memory (MRAM) and Magnetic imaging using Magnetic Force Microscopy (MFM). He has published many SCI registered papers and has presented his results at prestigious international conferences.