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Tensor Components in Three Pulse Vibrational Echoes of a Rigid Dipeptide
Dreyer, Jens,Moran, Andrew M.,Mukamel, Shaul Korean Chemical Society 2003 Bulletin of the Korean Chemical Society Vol.24 No.8
The effects of different polarization conditions on vibrational echo signals are systematically explored for the rigid cyclic dipeptide 2,5-diazabicyclo[2,2,2]octane-3,6-dione. An anharmonic vibrational Hamiltonian is constructed by computing energy derivatives to fourth order using density functional theory. Molecular frame transition dipole orientations are then used to calculate polarization dependent orientational factors corresponding to various Liouville space pathways. Enhancement and elimination of specific peaks in twodimensional correlation plots is accomplished by identifying appropriate pulse configurations.
Microscopic Domain Structures in NiO Exchange - coupled Films
D. G. Hwang,J. K. Kim,S. W. Kim,S. S. Lee,M. Dreyer,R. D. Gomez 한국자기학회 2002 Journal of Magnetics Vol.7 No.3
The dependence on nickel oxide thickness and a ferromagnetic layer thickness in unidirectional and isotropic exchange-coupled NiO/NiFe(Fe) bilayer films was investigated by magnetic force microscopy to better understand the relation between magnetic domain structure and exchange biasing at microscopic length scales. As the NiO thickness increased, the domain structure of unidirectional biased films formed smaller and more complex in-plane domains. By contrast, for the isotropically coupled films, large domains generally formed with increasing NiO thickness including a cross type domain with out-of plane magnetization orientation. The density of the cross domain is proportional to exchange biasing field, and the fact that the domain mainly originated from the strongest exchange coupled region was confirmed by imaging in an applied external field during a magnetization cycle.