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비정질 리본의 자기장중 열처리에 의한 보자력 노이즈의 변화에 관한 연구
최근화(Geunhwa Choi),손대락(Derac Son) 한국자기학회 1994 韓國磁氣學會誌 Vol.4 No.2
Magnetic field annealing method has been used to obtain proper hysteresis loop shapes which are useful to a device using amorphous ribbon. In this study, two pairs of Helmhotz coils Were used to apply longitudinal and transverse magnetic field during annealing. For the measurement of coercive field strength noise which depends on magnetic field annealing, Co-based amorphous alloy ribbon VITROVAC^® 6030 was used. For the sample which was annealed under dc transverse and dc longitudinal magnetic field, coercive field strength noise was nearly independent of magnetizing frequency ranging from 1 to 100㎑, but dc transverse and ac longitudinal magnetic fields annealed samples show that the coercive field strength noise decreased in power of magnetizing frequency. When magnetic domain nucleation occurred, the coercive field strength noise increased remarkably and decreased in power of magnetizing frequency.
최근하(K. W. Choi),손대락(D. Son),조육(Y. Cho) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.4
In order to measure magnetic field difference, we have constructed a fluxgate magnetometer which is based on the measurement of apparent corecive field strength from the magnetizing current of two sensors. Co-based amorphous ribbon, which has square shape of ac hysteresis loop, was used as core material. Two sensors have 315 turns of the primary and the secondary windings respectively, and core size of 2 ㎜ wide and 30 ㎜ long. The primary windings are connected parallel to measure external magnetic field difference and the secondary windings serieally for the averaged magnetic induction of the cores. The constructed magnetometer could measure magnetic field difference with sensitivity of 1.6×10^6 V / T and resolution of 1 nT at 1 ㎐ bandwidth.