颗粒大小分布对铁薄膜矫顽力的影响研究  

INFLUENCE OF PARTICLE SIZE DISTRIBUTION ON COERCIVITY BEHAVIOR OF IRON FILM

作　　者：周小莉[1] 魏纳新[1] 

机构地区：[1]浙江台州学院物理系,临海317000

出　　处：《物理学进展》2006年第3期511-515,共5页Progress In Physics

摘　　要：研究了沉积在液体基底表面铁薄膜的矫顽力与温度的依赖关系。研究发现：在极低温下，矫顽力先随温度增加迅速增大，在临界温度Tc=10-15K左右达最大。超过该温度后。矫顽力又快速下降，至65K后下降幅度减慢。分析表明：高于临界温度时沉积在液体基底表面铁薄膜的矫顽力与温度的关系强烈地受颗粒大小分布的影响；导致在Tc上、下温区磁化机制的改变可能是与铁薄膜及其氧化层中的无序自旋在低温时出现类自旋玻璃态密切相关。The relation between the coercivity behavior of iron （Fe） films deposited on liquid substrates and the temperature has been studied. It is found the coercivity increases drastically with temperature when the temperature is less than a critical value Tc, around 10-15 K. When T 〉Tc, however, the coercivity decreases rapidly and then it approaches a steady value around the temperature T= 65 K. Further analysis shows that the coercivity-temperature relationship is very susceptible to the particle size distribution above the critical temperature. The change of the magnetic mechanism in the temperature regions above and below T, may be related to the spin-glass-like phase below freezing temperature in the Fe film and its oxide layer.

关 键 词：铁薄膜 矫顽力 颗粒 各向异性 

分 类 号：O484.2[理学—固体物理]