【摘要】 提出了可以在0.5~5GHz频带扫频测量磁性薄膜复磁导率rμ的微带线法,推导出了由倒置短路微带线单端口网络的反射系数R(S11)表示rμ的理论公式。对微带线夹具进行了设计,并结合虚拟仪器技术,以LabVIEW为软件平台建立了一套测量薄膜微波复磁导率的自动测量系统。给出了FeCo基磁性纳米颗粒膜的磁导率测试曲线,表明微带法具有准确性较高、既适宜于面内各向异性薄膜又适合于各向同性薄膜的测量和容易操作等优点。更多还原

【Abstract】 A microstrip line method for making broad-band（0.5～5GHz）and frequency-sweep measurement on complex permeability of thin magnetic films is presented.The theoretical formulas,in which S₁₁ is expressed as the function of μ_r for short-circuited and inverted microstrip line network,are derived.A sample of the microstrip line holder is designed.An automatic measurement system of virtual instrumentation,is developed for measuring complex permeability of nano-magnetic thin films materials under microwave frequency.Measured curves for μ_r of FeCo-based nano-magnetic thin granule films material are given.The measurement results demonstrate that the method proposed is of high accuracy and easy operation.更多还原