Fe₁-xCox계의 결정구조와 자기적인 성질

다국어 초록 (Multilingual Abstract)

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.