Zn_(1-x)Co_xO纳米复合薄膜的磁特性  

Magnetic Properties of Zn_(1-x)Co_xO Nano-films

作　　者：任妙娟[1] 唐海马[1] 赵鹏[1] 张军[1] 

机构地区：[1]济南大学理学院,济南250022

出　　处：《微细加工技术》2007年第6期24-26,共3页Microfabrication Technology

基　　金：济南大学博士基金资助项目(B0404)

摘　　要：用磁控溅射交替沉积和退火的方法制备了不同Co含量的ZnO纳米颗粒薄膜Zn1-xCoxO,并研究了其磁特性。发现室温下的比饱和磁矩随Co含量x(体积比)的减小而单调下降,矫顽力在x=0.5附近达到极大值。在温度从5 K升到50 K的过程中,磁矩迅速下降,50 K以上,磁矩基本不随温度变化。其原因是低温下,小的颗粒表现出铁磁性,随着温度升高至50 K,小颗粒变成超顺磁性,只有那些较大的颗粒才表现出磁性。Zn1-xCoxO nano-films with various proportion of Co were prepared by magnetron sputtering method and annealing.The magnetic properties were studied.At room temperature,both magnetization and remanence ratio decrease monotonously.The coercive force has a maximum when the proportion of Co x is 0.5.At temperature bellow 50 K,all samples are ferromagnetic,while the temperature increases to higher than 50 K,partial of magnetization will lose.The smaller particals translates from magnetism to superparamagnetism.

关 键 词：纳米复合膜 磁特性 Zn1-xCoxO 

分 类 号：TM277[一般工业技术—材料科学与工程]