纳米磁性颗粒膜(Fe_65Co_35)_x(SiO_2)_(1-x)的微结构和磁性  

MICROSTRUCTURE AND MAGNETISM OF (Fe_65Co_35)_x(SiO_2)_(1-x) NANO-GRANULAR FILM

作　　者：陈忠强[1] 葛世慧[1] 姚东升[1] 尹晶磊[1] 左华平[1] 

机构地区：[1]兰州大学磁学与磁性材料教育部重点实验室,甘肃兰州730000

出　　处：《真空与低温》2008年第2期78-81,共4页Vacuum and Cryogenics

基　　金：国家自然科学基金(50571041)资助

摘　　要：用射频磁控溅射制备了由FeCo纳米磁性颗粒分布在SiO2绝缘介质中形成的(Fe65Co35)0.4(2SiO2)0.58纳米颗粒膜。通过低温磁场回火得到很好的软磁性,易轴矫顽力低至143Am-1;并呈现很好的面内单轴磁各向异性,各向异性场为3820Am-1;电阻率高达13.4mΩ·cm。样品的磁谱(磁导率与频率的关系)显示出很好的高频特性:在工作频率f<0.7GHz时,复数磁导率的实部μ′>100,FMR频率达1.8GHz,说明样品有高的截止频率,显示出在高频器件及抗电磁干扰技术方面具有很好的应用前景。用铁磁共振实验证明此样品中好的高频软磁性是由于实现了颗粒间的铁磁性交换耦合所致。（Fe65Co35）0.42（SiO2）0.58sgranular film consisting of FeCo nanoscale magnetic granules embedded in SiO2 matrix was fabricated by radio frequency （RF） magnetron sputtering. Excellent soft magnetic properties with anisotropy field Hi = 3 820 Am^-1, coereivity in easy axes low as to as 143 Am^-1 and resistivity up to 13.4 mΩ ·cm were obtained after the sample was annealed in a magnetic field at low temperature. At a frequency lower than 0.7 GHz, the real partμ＇ of complex permeability of this sample is above 100 and the FMR frequency is as high as 1.8 GHz, implying a high cut-off frequency for high frequency applications, which makes it promising in the applications in high frequency device and anti-jamming technology. It was proved by ferromagnetic resonance that the good soft magnetic properties in this sample come from the ferromagnetic intergranular exchange coupling.

关 键 词：颗粒膜 高频软磁性 颗粒间相互作用 

分 类 号：O484.4[理学—固体物理]