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Computer Interface를 이용한 핵 사중극 공명 Gaussmeter의 제작
김해진(H. J. Kim),신종필(J. P. Shin),조성호(S. H. Choh),김창석(C. S. Kim) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.2
When the low magnetic field is applied to the symmetry axis of the axial symmetric electric field gradient tensor of the quadrupolar nucleus in the crystal with nuclear spin, I = 1, two split resonance frequencies are observed by the Zeeman effect on the nuclear quadrupole resonance. The applied magnetic field is proportional to the difference of the two resonance frequencies and this proportionality constant for the ¹⁴N of (CH₂)_6N₄ single crystal is 0.16 mT/㎑. The NQR spectrometer is interfaced with a personal computer from which the resonance signals are displayed and the value of magnetic field is obtained directly from the difference of the two resonance frequencies. The lowestest measured magnetic field was 0.20 mT using this NQR technique.
VTE 처리된 강유전 LiNbO₃ 단결정 내의 Nd³+와 Er³+ 초미세 구조의 비등방성
박일우(I.-W. Park),조성호(S. H. Choh),김영미(Y. M. Kim),전웅(U. Chon),김상수(S. S. Kim),김원정(W. J. Kim),김봉구(B. G. Kim),손재민(J. M. Sohn) 한국자기학회 2005 韓國磁氣學會誌 Vol.15 No.2
We have obtained sharp and clearly resolved ESR spectra of Nd³+ and Er³+ in vapor transport equilibrium (VTE) treated LiNbO₃ crystals, consequently have determined more accurate spin Hamiltonian parameters, than those in congruent samples. The anisotropic hyperfine structures of ¹⁴³Nd³+ and (145)^Nd³+ in the VTE-treated crystals at liquid helium temperature have been analyzed. It is proposed that both rare earth ions favor the lithium site in LiNbO₃ from the consideration of the determined anisotropic g-values.