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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.
코발트 나노 입자가 도입된 초상자성 고분자 박막의 제조 및 자성 연구
김유경(Y. Kim),윤명근(M. Yoon),김영미(Y. M. Kim),비탈리볼코프(V. Volkov),박일우(I.-W. Park),송호준(H. J. Song) 한국자기학회 2003 韓國磁氣學會誌 Vol.13 No.2
Superparamagnetic properties of self-aggregated cobalt nanoparticles in the perfluorinated ion-exchange polymeric membrane (MF-4SK) prepared by ion-exchange and recovery methods were investigated by transmission electron microscopy (TEM) and superconducting quantum interference device (SQUID) magnetometer at various temperatures. Our experimental results show that cobalt nanoparticles in MF-4SK for the concentration of 7.8×10^(19) atoms per 1g of polymer membrane exhibit superparamagnetic properties above the average blocking temperature (T_B), which is determined to be around 185 K at applied field of 500 Oe. The average particle radius of 4.0 ㎚ achieved from Langevin function fit is in good agreement with TEM observations. This experimental evidence suggests that cobalt nanoparticles in polymer film obey a single domain theory. The results are discussed in the light of current theory for the superparamagnetic behavior of magnetic nanoparticles.