Quantum Phenomena Observation Technology Team
Team Leader
Hyun Soon PARK (Ph.D.)
We aim to study quantum phenomena which appear in topological structures such as in nano-magnetic materials. We develop measuring technologies which enable us to observe quantum phenomena at high phase resolution under the controlled electric and magnetic fields in nanoscopic dimensions, mainly employing world-brightest electron beam interference technologies such as electron holography and Lorentz microscopy, in addition to very low temperature cryogenic technology, magnetic field control technology, and electron field control technology. We observe local electric and magnetic fields in nanoscopic dimensions including giant spin accumulations, topological magnetic materials, and vortices in high-Tc superconductors using these electron wave interference technologies.
- Improvement and development of technologies for electron interferometry
- Observations of magnetic, superconducting, and other materials by using electron interferometry
- Motion control of superconducting vortices and magnetic domains
- Electron beams carrying orbital angular momentum
- Development of measurement technologies for quantum phenomena observation
- May 02,2008
- Current pulses make the switch
- Park, H. S., Hirata, K., Yanagisawa, K., Ishida, Y., Matsuda, T., Shindo, D., and Tonomura, A.:
"Nanoscale magnetic characterization of tunneling magnetoresistance spin valve head by electron holography"
Accepted in Small (2012. 07. 19). - Park, H. S., Murakami, Y., Yanagisawa, K., Matsuda, T., Kainuma, R., Shindo, D., and Tonomura, A.:
"Electron holography studies on narrow magnetic domain walls observed in a Heusler alloy Ni50Mn25Al12.5Ga12.5"
Adv. Funct. Mater., doi: 10.1002/adfm.201103052 (2012). - Tonomura, A., Yu, X., Yanagisawa, K., Matsuda, T., Onose, Y., Kanazawa, N., Park, H. S., and Tokura, Y.:
"Real-space observation of skyrmion lattice in a helimagnet MnSi thin sample"
Nano Lett. 12, 1673 (2012). - Tanigaki, T., Inada, Y., Aizawa, S., Suzuki, T., Park, H. S., Matsuda, T., Taniyama, A., Shindo, D., and Tonomura, A.:
"Split-illumination electron holography"
Accepted in Appl. Phys. Lett. (will be published in 2012.07.23) - Hirata, K., Ishida, Y., Akashi, T., Shindo, D., and Tonomura, A.:
"Electron holography study of magnetization behavior in the writer pole of a perpendicular magnetic recording head by a 1 MV transmission electron microscope"
J. Electron Microsc., doi: 10.1093/jmicro/dfs051, (2012). - Suzuki, T., Aizawa, S., Tanigaki, T., Ota, K., Matsuda, T., and Tonomura, A.:
"Improvement of the accuracy of phase observation by modification of phase-shifting electron holography"
Ultramicroscopy 118, 21 (2012). - Akase, Z., Kasai, H., Mamishin, S., Shindo, D., Morita, M., and Tonomura, A.:
"Imaging of magnetic flux distribution in vicinity of insulating particles in high-Tc superconductor by electron holography"
J. Appl. Phys. 111, 033912 (2012). - Tanigaki, T., Aizawa, S., Suzuki, T., and Tonomura, A.:
"Three-dimensional reconstructions of electrostatic potential distributions with 1.5 nanometer resolution using off-axis electron holography"
J. Electron Microsc. 61(2), 77 (2012). - Xia, W. X., Aizawa, S., Tanigaki, T., Suzuki, T., Yoshizawa, Y., Shindo, D., and Tonomura, A.:
"Magnetization distribution of magnetic vortex of amorphous FeSiB investigated by electron holography and computer simulation."
J. Electron Microsc. 61(2), 71 (2012). - Murakami, Y. , Nii, Y., Arima, T., Shindo, D., Yanagisawa, K., and Tonomura, A.:
"Magnetic domain structure in the orbital-spin-coupled system MnV2O4"
Phys. Rev. B 84, 054421 (2011).
Principal Investigator
- Hyun Soon PARK
- Team Leader
Staff Scientist
- Yoshie MUROOKA
- ASI Research Scientist
Postdoctoral Fellow
- Toshiaki TANIGAKI
- Contract Researcher
Technical Assistant
- Shinji AIZAWA
- Technical Staff I