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 Tc. 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
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