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Fe - Si - C 합금의 합금화 과정에 따른 구조 및 자기적 특성 변화 연구
유용구(Yong-Goo Yoo),김태엽(Tae Yub Kim),김약연(Yark Yeon Kim),한기평(Gi Pyeong Han),유성초(Seong-Cho Yu),양동석(Dong-Seok Yang),J. M. Greneche(J. M. Greneche) 한국자기학회 2002 韓國磁氣學會誌 Vol.12 No.5
Fe-Si-C alloy system has been made by mechancial alloying process. The structural and magnetic propeties were analysed as a function of processing times. The structural properties were investigated by X-ray diffraction and EXAFS experiments. The magnetic properties were measured by vibrating sample magnetometer and Mossbauer spectroscopy. As processing time increases, Si and C atoms diffuse into a α-Fe structure and then bcc solid solution is formed after 12 hours of the processing time. The magnetization and the hyper fine field decreased steeply up to 4 hours and then it changed slowly. After 12 hours of the processing time, it almost saturated. These results were agreed with the structural variation.
유용구(Yong-Goo Yoo),박남석(Nam-Seok Park),민성기(Seong-Gi Min),유성초(Seong-Cho Yu) 한국자기학회 2005 韓國磁氣學會誌 Vol.15 No.5
Exchange bias effect of a various layered thin films were studied by FMR measurment. In plane angular dependence of a resonance field distribution which measured by FMR was analysed as a combined effect of an unidirectional anisotropy and an uniaxial anisotropy. Exchange biased NiFe/IrMn, IrMn/NiFe/IrMn, and NiFe/IrMn/CoFe thin films showed larger unidirectional anisotropy field and uniaxial anisotropy field with compared to that of an unbiased NiFe single thin film. In case of NiFe/Cu/IrMn, the film with thick Cu layer exhibited a similar trend to the unbiased NiFe thin film. NiFe/IrMn/CoFe thin film showed two resonance field distribution due to different ferromagnetic layers. In additon to the resonance field, the line width was also analysed with related to exchange bias effect.
Ni-Mn-Ga 자성 형상 기억 합금에 대한 EXAFS 연구
양동석 ( Dong Seok Yang ),유용구 ( Yong Goo Yoo ),민성기 ( Sung Gi Min ),강병식 ( Bing Zhi Jian ),유성초 ( Seong Cho Yu ) 충북대학교 과학교육연구소 2005 과학교육연구논총 Vol.21 No.2
In this study, the local structure of Ni2MnGa alloy has been examined by the extended X-ray absorption fine structure. We found that there were a significant variations in the harmonic disorder parameters and anharmonic disorder parameters of neighboring Ni ions around Gaion. However, there are no clear evidences on the Jahn-Teller lattice distortion in Ni2MnGa fromthe EXAFS analysis.