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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.