Dr Shuichi Mamishin
Telephone : +44.1188.8.131.52 (Direct)
Email: sm991 (add domain name : "cam.ac.uk")
- Electron Miscroscopy
I have been working on developing a transmission electron microscope (TEM) since 2005 when I joined Hitachi. A 300 kV TEM model HF-3300 which is equipped with a field emission gun is the first TEM that I worked on to develop further electron holography functions. Then I collaborated with Osaka Univ. aiming to improve a eucentric goniometer dedicated to electron tomography. The goniometer has been installed in a 3 MV TEM model H-3000 in the Research Centre for Ultra-High Voltage Electron Microscopy Osaka Univ. since 2007. From 2008-2010, I was transferred to Dr Akira Tonomura's Lab. and engaged in observation of behaviour of vortices in high-temperature superconductors and the phenomenon of ferromagnetic domain switching.
Recent Research projects
My current research is to develop phase plate functions in a TEM. Electron micrographs acquired by soft materials such as biological specimens cause problems of weak phase contrasts due to weak interactions between incident electrons and atoms. Phase plates are a tool to control a phase contrast transfer function (PCTF) so that phase contrasts can be enhanced under in-focus observation conditions. This will be a promising solution to weak phase contrasts.
Z. Akase, H. Kasai, S. Mamishin, D. Shindo, M. Morita, and A. Tonomura, J. Appl. Phys. 111, 3, 033912 (2012), Imaging of magnetic flux distribution in vicinity of insulating particles in high-T-c superconductor by electron holography
S. Mamishin, H. Kasai, W. X. Xia, Y. Murakami, D. Shindo, S. Mori, and A. Tonomura, Jpn. J. Appl. Phys. 49, 6, 063003 (2010), Lorentz Microscopy Study on Magnetization Reversal Process in Single-Domain State in Perovskite-Type Manganite
Y. Murakami, H. Kasai, J. J. Kim, S. Mamishin, D. Shindo, S. Mori, and A. Tonomura, Nature Nanotechnology 5, 1, 37 (2010), Ferromagnetic domain nucleation and growth in colossal magnetoresistive manganite