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채유석,송갑득,강봉휘,서무교,이덕동 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
The simple solid electrolyte carbon dioxide sensor was fabricated using Li ionic conductor with a heater and Li_(2)CO_(3)+Na_(2)CO_(3)+K_(2)CO_(3) (47.6 : 25.4 : 27.0) as a metal carbonate auxiliary phase. The electromotive force(EMF) was in excellent agreement with the EMF value calculated from the Nernst' s equation for CO_(2) gas concentration from 950 to 9,950ppm at 420℃, with the response time of 15~25 sec.. Water vapor hardly affected the sensor characteristics for relative humidity from 40% to 90%, in contrast to the case of the Li_(2)CO_(3) and Na_(2)CO_(3) + BaCO_(3)(1 : 1.7). The CO_(2) sensitivity of this sensor was stable for the test period of 240 hours.
Roughness Exponent of Domain Interface in CoFe/Pt Multilayer Films
Kang-soo Lee,Chang-won Lee,Young-jin Cho,Sunae Seo,Dong-Hyun Kim,Sug-Bong Choe IEEE 2009 IEEE transactions on magnetics Vol.45 No.6
<P>Critical scaling behavior of magnetic domain interfaces is experimentally investigated in Pt/CoFe/Pt single-layer film (type I) and (CoFe/Pt)<SUB>4</SUB> multilayer film (type II). Even though both samples exhibit domain wall propagation with rare nucleation, the domain interface profile is found to be very contrasting. Typical overhanging interfaces, in contrast to smooth interfaces in type I film, are observed in type II film. Both types of the interface profiles obey power laws. In log-log scaling plot of the roughness with respect to the interface segment length, the slopes, i.e., the scaling exponents, are estimated to be 0.66 plusmn 0.02 and 0.98 plusmn 0.03 for type I and II films, respectively. These values of the scaling exponents correspond to two distinct criticality classes of the self-affine and self-similar regimes in random-field Ising model, respectively.</P>
Fractal Dimension of Magnetic Domain Walls in CoFe/Pt Multilayers
Kang-Soo Lee,Dong-Hyun Kim,Sug-Bong Choe 한국자기학회 2010 Journal of Magnetics Vol.15 No.3
We present the fractal properties of the magnetic domain walls in (5-A Co??Fe₁?/10-A Pt)n multilayer films with perpendicular magnetic anisotropy for the number of repeats n (1 to 5). In these films, the magnetization reversed due to the domain wall propagation throughout the films with rare nucleations. As n increased, it was observed that the jaggedness of the domain walls increased noticeably, which is possibly due to the accumulation of irregularities at the layer interfaces. The jaggedness of the domain walls was analyzed in terms of the fractal dimension by use of the ruler method, and it was revealed that the fractal dimension significantly changed from 1.0±0.002 to 1.3±0.05 as n increased from 1 to 5.