Effect of film thickness on magnetic properties of Cr/SmCo/Cr films  

作　　者：李宁 李宝河 冯春 李明华 于广华 

机构地区：[1]Department of Materials Physics and Chemistry,University of Science and Technology Beijing [2]Department of Physics,Beijing Technology and Business University

出　　处：《Journal of Rare Earths》2012年第5期446-449,共4页稀土学报（英文版）

基　　金：Project supported by National Natural Science Foundation of China (50871014);New Teacher Foundation of Ministry of Education(200800081030);Funding Project for Academic Human Resources Development in Institutions of Higher Learning Under the Jurisdiction of Beijing Municipality (PHR201007122);Beijing Natural Science Foundation (2102014)

摘　　要：Cr/SmCo/Cr films with different SmCo thickness were deposited on glass substrates by magnetron sputtering,followed by an annealing process at 550 °C for 20 min.Experimental results showed that the SmCo film of 30 nm exhibited two-phase behavior in the demagnetization process,the obvious kink was observed near zero.For the SmCo film of 50 nm,the kink was invisible,and a single phase like behavior was obtained in the demagnetization process.The reversal behavior became consistent in the thicker films.Moreover,the coercivity reduced and the saturated magnetization increased obviously with the increasing thickness.X-ray diffraction results indicated that the average grain size of SmCo 5 in the thicker films were almost 30 nm,but the quantity of SmCo 5 grains increased with the increasing thickness,which enhanced the intergrain exchange coupling（IEC） of the SmCo 5 hard phases.The increase of IEC improved the magnetic properties of SmCo films with increasing thickness.Cr/SmCo/Cr films with different SmCo thickness were deposited on glass substrates by magnetron sputtering,followed by an annealing process at 550 °C for 20 min.Experimental results showed that the SmCo film of 30 nm exhibited two-phase behavior in the demagnetization process,the obvious kink was observed near zero.For the SmCo film of 50 nm,the kink was invisible,and a single phase like behavior was obtained in the demagnetization process.The reversal behavior became consistent in the thicker films.Moreover,the coercivity reduced and the saturated magnetization increased obviously with the increasing thickness.X-ray diffraction results indicated that the average grain size of SmCo 5 in the thicker films were almost 30 nm,but the quantity of SmCo 5 grains increased with the increasing thickness,which enhanced the intergrain exchange coupling（IEC） of the SmCo 5 hard phases.The increase of IEC improved the magnetic properties of SmCo films with increasing thickness.

关 键 词：SmCo film permanent magnet coercivity reversal behavior rare earths 

分 类 号：TB383.2[一般工业技术—材料科学与工程]