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희토류 영구자석의 자성측정을 위한 고감도 펄스마그네토미터
김윤배(Y. B. Kim),G. A. Kapustin(G. A. Kapustin) 한국자기학회 2005 韓國磁氣學會誌 Vol.15 No.4
A 8MA/m-class pulsed field magnetometer has been constructed by composing a pulsed field magnet, a pickup coil, analog integrators, a digital storage oscilloscope and a personal computer. For precision measurements, a 3-axis compensation principle has been applied for the fabrication of pickup coil, and the compensation level of the order of 10^(-6) and the sensitivity of 5ㆍ10^(-7) Am² for magnetic moment have been obtained. The high sensitivity of the magnetometer is good enough for measurements of magnetic properties of rare earth magnets in small size or thin films shorter than 3 ㎜φ in diameter.
Hyoung-Tae Kim,Yoon-Bae Kim,G. A. Kapustin,Woo-Yong Jeon,Hak-Shin Kim 한국자기학회 2002 Journal of Magnetics Vol.7 No.4
Magnetic properties, microstructure and texture of NdFeB magnets fabricated by a modified hot working process from commercial melt-spun powders (Magnequench; MQPA, MQPB and MQPB+) have been investigated. The hot-pressed isotropic magnet made from MQPA powder, which contains higher Nd content than that of MQPB or MQPB+, shows higher coercivity. The magnet also shows homogenous and fine grains with higher coercivity for higher consolidation pressure. The hot-deformed MQPA magnet shows a strong anisotropy along the press direction with homogeneous platelet Nd₂Fe₁₄B grains of 50~100 ㎚ in thickness and 200~500 ㎚ in length. The hot-deformed MQPB+ magnet, however, shows low remanence and low coercivity. The microstructure of the magnet consists of two areas; undeformed Nd₂Fe₁₄B grains and well-aligned but large grains with 3~4 ㎛ in length. Low Nd content attributes to the formation of the two different area.