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방사광 광전자 분광법을 이용한 Co - Pd 합금박막의 전자구조 연구
강정수(J. S. Kang),권세균(S. K. Kwon),하양장(Y. J. Ha),민병일(B. I. Min),조용필(Y. P. Cho),이창섭(C. S. Ri),정인범(I. B. Chung),구양모(Y. M. Koo),김건호(K. H. Kim),김봉수(B. S. Kim) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.6
Valence band photoemission spectroscopy (PES) measurements have been performed for Co_xPd_(100-x) alloy films using synchrotron radiation (x=0, 25, 40, 65). Then the partial spectral weight distributions (PSW’s) of Co 3d and Pd 4d electrons have been determined. The Co 3d PSW’s exhibit some structures which are quite different from those of the Co film for x<25 %, whereas they become very similar to those of the Co film for x>40 %. For x<25 %, the peak near the Fermi level (E_F) and a shoulder around 2 eV binding energy in the Co 3d PSW reflect large hybridization between Pd 4d and Co 3d electrons, suggesting that the hybridization might play an inportant role in determining perpendicualr magnetic anisotropy. The Pd 4d PSW’s in Co-Pd alloy films are found to have larger FWHM’s (full widths at half maximum), larger binding energies of the main peaks, and larger spectral intensities at E_F than the PES spectrum of the Pd film. The FWHM of the Pd 4d PSW increases with decreasing Pd concentration, which are considered to reflect the disordering effect in the alloy formation or the change in the Pd 4d electronic structure due to hybridization between Co 3d and Pd 4d electrons.
PARK,H.J.,PARK,J.B.,LEE,H.J.,CHUNG,S.C.,WONG,E.K.,JONES,J.P.,MIN,B.I.,CHO,Z.H. WHO COLLABORATING CENTRE FOR TRADITIONAL MEDICINE 1998 東西醫學硏究所 論文集 Vol.1998 No.-
A preliminary study of the correlation between acupuncture points (acupoints) for the treatment of eye disorders suggested by ancient Oriental literature and the corresponding brain localization for vision described by Western medicine was performed by using functional MRI (fMRI). The vision-related acupoint (VAI) is located in the lateral aspect of the foot, and when acupuncture stimulation is performed there, activation of occipital lobes is seen by fMRI. Stimulation of the eye by directly using light results in similar activation in the occipital lobes by fMRI. The experiment was conducted by using conventional checkerboard 8-Hz light-flash stimulation of the eye and observation of the time-course data. This was followed by stimulation of the VA1 by using the same time-course paradigm as visual light stimulation. Results obtained with l2 volunteers yielded very clean data and very close correlations between visual and acupuncture stimulation. We have also stimulated nonacupoints 2 to 5 cm away from the vision-related acupoints on the foot as a control, and activation in the occipital lobes was not observed. The results obtained demonstrate the correlation between activation of specific areas of brain cortices and corresponding acupoint stimulation predicted by ancient acupuncture literature.