纳米Fe-In_2O_3颗粒膜的结构和磁特性  

STRUCTURES AND MAGNETIC PROPERTIES OF NANOMETRIC Fe-In_2O_3 GRANULAR FILMS

作　　者：张林[1] 刘宜华[1] 张连生[1] 张汝贞[1] 黄宝歆[1] 

机构地区：[1]山东大学物理与微电子学院,济南250100

出　　处：《金属学报》2003年第1期109-112,共4页Acta Metallurgica Sinica

基　　金：国家自然科学基金59981004资助项目

摘　　要：采用射频溅射法制备了纳米“铁磁金属-半导体基体”Fex(In2O3)1-x颗粒膜,并研究了其结构和磁特性.根据颗粒膜低场磁化率x(T)温度关系和不同温度下的磁滞回线,证实了在一定的温度范围内,颗粒膜中的纳米铁颗粒表现出磁性弛豫效应:当截止温度TB=50 K时,颗粒膜的磁性由超顺磁性转变为铁磁性.当温度降低到某一临界温度TP时,颗粒膜中结构变化导致磁化状态发生“铁磁态-类自旋玻璃态”转变,探讨分析了在低温下颗粒膜发生结构变化的原因.Fe-x(In2O3)(1-x) granular films were fabricated by the radio frequency sputtering, and the structures and magnetic properties of nanometer ferromagnetic metal-semiconductor matrix Fe-x(In2O3)(1-x) granular films have been studied. According to the dependence of low field susceptibility on temperature and the hysteresis loops at different temperature, it was found that the nanometer-sized Fe particles in granular films showed the magnetic relaxation effect at definite temperature. The magnetic property of granular films changes from super-paramagnetic into ferromagnetic at the blocking temperature T-B=50 K. The change of structure in granular films results in the transition of state from ferromagnetic to spin-glass-like at a certain critical temperature with decreasing temperature. The cause of change of structure in granular films at low temperature are explored and analyzed.

关 键 词：纳米Fe-In2O3颗粒膜 结构 磁特性 相变 

分 类 号：TB383[一般工业技术—材料科学与工程]