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이용호(Y.H.Lee),이연숙(Y.S.Lee),신용돌(Y.D.Shin),문기원(K.W.Moon),노태환(T.H.Noh),김희중(H.J.Kim),강일구(I.K.Kang) 한국자기학회 1991 韓國磁氣學會誌 Vol.1 No.1
A measurement system for magnetic anisotropy was built. The torque acting on the disc or sperical samples placed in uniform magnetic field was detected with a capacitive transducer which is connected with a transformer ratio-arm bridge. The output of the bridge was amplified with a lock-in amplifier. The cubic anisotropy constant for (100) of 3% Si-Fe was 3.3×10⁴ J/㎥. The calibration for the system was carried out with the shape anisotropy of a thin Ni wire.
열처리 효과에 따른 Zn0.7Mn0.3O 박막의 자기 특성 연구
김영미(Y. M. Kim),김유경(Y. Kim),윤명근(M. Yoon),박찬수(C. S. Park),이연숙(Y. S. Lee),전미선(M. S. Jeon),박일우(I.-W. Park),박용주(Y. J. Park),유종훈(Jong H. Lyou),김상수(S. S. Kim) 한국자기학회 2003 韓國磁氣學會誌 Vol.13 No.4
We report on the annealing effect and ferromagnetic characteristics of Zn_(0.7)Mn_(0.3)O film prepared by sol-gel method on the silicon (100) substrate using field emission-scanning electron microscopy (FE-SEM), energy dispersive spectroscopy (EDS), X-ray diffractometry (XRD) and superconducting quantum interference device (SQUID) magnetometry. Magnetic measurements show that Zn_(0.7)Mn_(0.3)O films exhibit ferromagnetism at 5 K revealing the coercive field of ~110 Oe for as grown sample and 360, 1035 Oe for samples annealed at 700, 800 ℃, respectively. Our experimental evidence suggests that ferromagnetic precipitates of a manganese oxide may be responsible for the observed ferromagnetic behaviors of the film.