FeCo基纳米晶合金的结构及高频特性  

Microstructure and high-frequency magnetic properties of FeCo based nanocrystalline magnetic alloys

作　　者：王光建[1] 王治[2] 汤志伟[1] 

机构地区：[1]河北工程大学理学院,邯郸056038 [2]天津大学理学院,天津300072

出　　处：《功能材料与器件学报》2009年第3期307-310,共4页Journal of Functional Materials and Devices

基　　金：国家自然科学基金项目(50271047)

摘　　要：研究了(Fe0.5Co0.5)73.5Nb2V1Si13.5B9Cu1合金经不同温度退火后的结构及磁谱曲线。XRD分析表明,随着退火温度的升高,晶化相体积增加;同时晶格常数减少说明更多的Co溶入到晶化相α-FeCo(Si)中。用阻抗分析仪测量了合金在1kHz-10MHz范围的磁谱曲线。结果表明,合金的截止使用频率可达105～106Hz,且随退火温度的升高,合金的截止使用频率逐渐提高,但初始磁导率μi和截止使用频率f0的乘积保持为常数,用畴壁运动方程及畴壁钉扎理论对此进行了解释。并讨论了进一步提高合金高频性能的途径。The structure and permeability - frequency spectra of（Fe0.5Co0.5）73.5,Nb2V1Si13.5B9Cu1 alloys annealed at different temperatures was investigated. XRD analysis showed that with the annealing temperature increased, the lattice parameter of a - FeCo （Si） crystallites decreased because of the large Co solubility in the a - FeCo （Si） solid solution and the average grain size increased appreciably. Permeability - frequency spectra from 1 kHz to 10 MHz was studied by using an impedance analyzer for nanoerystalline （ Fe0. 5 Co0. 5 ） 73.5 Nb2 V 1Si13.5 B9 Cu1 alloys annealed at different temperatures. It was shown that relaxation frequency （f0） could get to 105 -106Hz, moreover the relaxation frequency （f0） increased with the annealing temperature increased, but the product of initial permeability （μi） and relaxation frequency （f0） kept a constant. The reasons were analyzed by the equation of domain wall motion and domain wall pinning mechanism. At the end, the way about how to improve the property of nanocrystalline alloys in high frequency was discussed.

关 键 词：双相纳米晶合金 退火温度 初始磁导率 截止使用频率 畴壁钉扎 

分 类 号：O482.523[理学—固体物理] O482.54[理学—物理]