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Fe0.8Co0.18(BN)0.02의 열처리 및 소성변형에 의한 결정구조와 자기적 성질
김정기(J. G. Kim),한경훈(K. H. Han),이상문(S. M. Lee),정재윤(J. Y. Jeong),김예니(Y. N. Kim),신경호(K. H. Shin) 한국자기학회 2000 韓國磁氣學會誌 Vol.10 No.5
The crystallographic and magnetic properties of the sample Fe_(0.8)Co_(0.18)(BN)_(0.02) synthesized by microwave arc-melting with the maximum power of 3.5 ㎾ have been studied by the methods of an X-ray diffraction and the measurement of the magnetic hysteresis using the vibrating sample magnetometer at room temperature. The samples were prepared in a form of pellet pressed under the pressure of 9,000 N/㎠, rolled coldly, and treated with the different temperatures. The X-ray diffraction pattern of pelleted sample shows that the crystal structure of the sample is bcc as same as that of Fe with a good uniformity. The X-ray diffraction pattern shows that a residual stress, which exists in the sample, is eliminated by final 900℃ annealing. As rolling rate and heat treatment temperature increases, the saturation magnetization and the remanence of the samples increase whereas the coercivity of the samples shows decrease. Also the saturation magnetization and the remanence of the samples were affected by rolling rate and rolling direction than heat treatment temperature, but the coercivity of the samples was affected by rolling rate and direction as well as heat treatment temperature. This means that a domain wall motion is easy due to elimination of a residual stress and an inclusion which exists in the sample by rolling and heat treatment and a local induced-magnetization easy axis was also formed to parallel to the rolling direction due to creation of the like-atom pairs across the slip plane by rolling.
김정기(J. G. Kim),한경훈(K. H. Han),서정철(J. C. Sur) 한국자기학회 1999 韓國磁氣學會誌 Vol.9 No.4
The crystallographic and magnetic properties of the system of Fe_(1-x)Co_x (x=0.2 and 0.4) prepared by microwave arc-melting with the maximum power of 3.5 ㎾ and a iron-foil with thickness of 25 ㎛ have been studied by the methods of X-ray diffraction and the measurement of the magnetic hysteresis using the vibrating sample magnetometer at room temperature. The samples were prepared in three different ways: First, pellet form pressed under the pressure of 9,000 N/㎠. Second, thin sheet cold rolled. Third, thin sheet treated with the temperature of 900℃. The X-ray diffraction pattern of the sample prepared by the first method shows that the crystal structure of the sample is bcc as same as that of Fe with a good uniformity. The iron-foil has the coercivity of 43 Oe and the initial slope of magnetization of 0.328 emu/gOe. The coercivity and magnetization of the sample prepared by the second method increased as the Co content increased. But the initial slop of the magnetization decreased as the Co content increased. This means that the displacement of domain wall is suppressed by the increase of coercivity as the Co content increased. The saturation magnetization of the samples made by the third method increased. On the other hand, the coercivity of these samples decreased. The increase of saturation magnetization of the samples seems to be related to the changes in X-ray intensity after heat treatment. Also some magnetic parameters of the samples were calculated by using a simple model and compared with other values.