摘要
采用磁控共溅射法制备了系列(Fe_(65)Co_(35))_(x)(SiO_2)_(1-x)纳米磁性颗粒膜,并研究了其微结构和微波特性。结果表明,样品在x=0.5～0.7的宽成分范围内表现出良好的软磁特性,H_c最大不超过4Oe,电阻率高达10~3μΩ·cm。样品同时具有良好的高频磁特性,磁谱的共振频率高达2.4GHz,可用于抗电磁干扰和微波吸收材料。HRTEM分析表明,Fe_(65)Co_(35)纳米颗粒均匀地镶嵌在绝缘的SiO_2介质中。由于Fe_(65)Co_(35)合金具有较长的交换长度,因此有利于加强磁性颗粒之间的交换耦合作用,使样品获得优良的软磁特性。更高体积分数的样品中颗粒之间的相互作用减弱,可能是因为未被平均掉的磁晶各向异性。
Abstract Microstructure and microwave properties of （Fees Coax ）. （SiO.~） 1., magnetic granular films fabricated by magnetron sputtering are studied. Results show that good soft magnetic properties have been obtained in a wide metal volume fraction range, coercivity H~ not exceeding 4Oe and electrical resistivity up to 10a/,~ ~ crn. HRTEM spectropy shows that Fe^sCo35 particles are embedded uniformly in an insulating SiO~ matrix. （）wing to long exchange length of Fe6s Co3s alloy which is the benefit of enhancement of exchange coupling between ferromagnetic particles, good soft magnetic properties can be obtained. However, the interaction of higher x decreases because of unaveraged magnetic anisotropy.
基金
国家自然科学基金(50901050)
关键词
纳米磁性颗粒膜
软磁特性
高频特性
交换耦合
magnetic nano-granular films, soft magnetic property, high frequency property, exchange coupling
