Jung Woo Yoo

PREVIOUS INSTITUTION: BS, Sung Kyun Kwan University, Korea
DATE JOINED GROUP: June 2001
AREAS OF STUDY: Photoinduced magnetism of organic based magnets
EMAIL: yoo.99@osu.edu
WEB: http://www.physics.ohio-state.edu/~jwyoo

CURRENT RESEARCH
The control of magnetic properties using optical stimulus has emerged as an area of research that has attracted considerable attention in recent research. This is partly due to it’s significant technological potential such as magneto-optic devices as well as novel phenomena itself. These novel materials include Prussian blue analogs, diluted magnetic semiconductors, doped manganites, and spin ferrite films. Recently, our group has developed the world's first light-tunable organic magnet (Mn(TCNE)), through a 25-year collaboration with Joel S. Miller group at the University of Utah. Upon excitation with blue light the magnetic susceptibility is substantially increased in the entire temperature region below T_c. The photoinduced state has a long life time ( > 10⁶ sec). Effects of illumination can be erased partially by different wavelength of light as well as be erased totally by annealing up to room temperature. The photoinduced magnetism is explained as a result of the formation of a metastable state. Currently, together with our collaborator from Joel S. Miller group at the University of Utah and Kazuhito Hashimoto group at the University of Tokyo we are investigating various novel phenomena of light-induced magnetic effects in molecular based magnets such as Prussian blue analogs and TCNE class magnets.

PRESENTATIONS

• Jung-Woo Yoo, Dušan A. Pejaković, Hiroko Tokoro, Shin-ichi Ohkoshi, Kazuhito Hashimoto, and A.J. Epstein, Magnetic Behavior and Photoinduced Demagnetization in Rubidium Manganese Hexacyanoferrate, APS March Meeting, Austin TX (2003).

Return to the main page
Webpage created 12 March 2003 by John Rohrbacher

Contact the webmaster