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        MAGNETO - OPTICAL KERR SPECTRA FOR AMORPHOUS RE - Co ALLOY FILMS

        최영준(Y. J. Choe),S. Tsunashima(S. Tsunashima),S. Uchiyama(S. Uchiyama) 한국자기학회 1994 韓國磁氣學會誌 Vol.4 No.2

        The magneto-optical Kerr spectra(λ=250~700㎚) of amorphous RE-Co(RE=Ce, Nd, Pr, Gd, Tb, Er, Ho) are compared with those of Y-Co films. It has been found that the Kerr rotation of RE-Co is mainly due to Co in the long wavelength region, whereas at short wavelength Ce, Pr, Nd, and Gd contribute positively, and Tb, Ho, and Er contribute negatively to the Kerr rotation of RE-Co amorphous films. In the interesting energy region(1.5~5.0 eV), the magneto-optical contribution of Pr and Nd are thought to be related with 4f↑ - 5d↑ inter band transition, and the contribution of Ce and Gd might be concerned with d→ p interband transition. The magneto-optical effect of Tb in the short wavelength region might be related with 4f↓- 5d↓ and/or 5d↓ - 4f↓, and that of Ho and Er can be explained by 4f↓ - 5d↓ magneto-optical interband transition.

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        Phase Transition in C4H12NI·I2

        H. Ishigami,M. Shiro,M. Sumita,S. Sato,T. Hori,Y. Tsunashima 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV

        The title compound C4H12NII2 was prepared addition of iodine to a tetramethylammonium iodide. The crystal showed anomalies at 218 K, 238 K and 308 K on dierential scanning calorimetry (DSC) measurement, whereas the crystal of tetramethylammonium iodide showed no anomaly. Crystal was grown by slow evaporation from an ethanol solution at 298 K. The crystal structure of orthorhombic C4H12NII2 of room temperature determined by use of a Imaging Plate diractometer is space group Pnnm, a = 14.115(1) A, b = 10.0997(7) A, c = 8.3019(5) A, V = 1183.5(3) A3, Z = 4. The present work reports the details of the crystal structure and phase transition of C4H12NII2.

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