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합성형 반강자성 결합 재료의 자기장 세기에 따른 토오크 신호 분석
윤석수(Seok Soo Yoon),전우상(Woo Sang Jun),김동영(Dong Young Kim) 한국자기학회 2011 韓國磁氣學會誌 Vol.21 No.3
We have analyzed the torque signals measured in synthetic antiferromagnetic (SAF) coupled CoFeB/Ru/CoFeB thin film, which signals were drastically changed at flopping field (H<SUB>F</SUB>) and saturation field (H<SUB>s</SUB>). The minimum value of negative uniaxial anisotropy constant (? K₁) was appeared at H<SUB>F</SUB>. The ? K₁ was due to the zero net magnetization by the antiferromagnetic coupling between two ferromagnetic layers. Whereas, the biaxial anisotropy constant (K₂) was induced in the field range of H<SUB>F</SUB> < H < H<SUB>s</SUB>. The induced K₂ was originated from deviation angles between magnetization directions of two ferromagnetic layers. And at H > H<SUB>s</SUB>, intrinsic uniaxial anisotropy constant of CoFeB layer was observed. These change of the anisotropy constant with magnetic field was explained by the magnetization process of two ferromagnetic layers based on Stoner-Wohlfarth model calculation for SAF thin film.
슬래브궤도의 소음저감을 위한 흡음재의 성능에 관한 연구
김진호(Kim Jin-Ho),이광도(Lee Kwang-Do),안광열(An Gang-Yell),전우상(Jun Woo-Sang) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
The construction of concrete slab track system is increased because the system has advantages which are maintenance free and so on, the other side, the system has weak points such as increase of the cost of the early stage construction and noise levels. The increment of noise is due to the reflection of generated noise on the slab tracks. Therefore the acoustic-absorptive materials are considered to reduce noise level. It has been made clear that acoustic-absorptive materials are effective for reducing the wheel/rail noise on slab tracks. The important performance of the acoustic-absorptive material is absorption rates and absorption rates are verified for the considered absorber elements using acoustic duct method. In addition, the required provisons for installing acoustic-absorptive block on slab tracks are considered.