The giant magneto-impedance(GMI)effect has been investigated in sandwiched FeCuCrVSiB films annealed at 300℃ for 1.5 h.The frequency and field dependences of the GMI have been observed in the frequency range from 50 ...The giant magneto-impedance(GMI)effect has been investigated in sandwiched FeCuCrVSiB films annealed at 300℃ for 1.5 h.The frequency and field dependences of the GMI have been observed in the frequency range from 50 kHz to 13 MHz.The GMI ratio increases at first with increasing frequency,and reaches its maximum value of 136%at a very low characteristic frequency of about 4 MHz,and then decreases with further increasing frequency.These superior properties are related to the special structure of the sandwiched films.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No.59981004the Doctoral Training Foundation of the National Education Commission under Grant No.9704225.
文摘The giant magneto-impedance(GMI)effect has been investigated in sandwiched FeCuCrVSiB films annealed at 300℃ for 1.5 h.The frequency and field dependences of the GMI have been observed in the frequency range from 50 kHz to 13 MHz.The GMI ratio increases at first with increasing frequency,and reaches its maximum value of 136%at a very low characteristic frequency of about 4 MHz,and then decreases with further increasing frequency.These superior properties are related to the special structure of the sandwiched films.
文摘研究了结构为(FM SiO2)3Ag(SiO2FM)3多层膜的巨磁阻抗(GMI)效应(这里的FM≡FeCuCrVSiB).多层膜采用射频溅射法沉积在单晶Si衬底上,沉积过程中,沿膜面长方向施加约72kA m的磁场,然后在不同的温度下对样品进行了退火处理.结果表明,该多层膜样品即使在沉积态便具有相当好的软磁性能和GMI效应,在7MHz的频率下,最大纵向和横向巨磁阻抗比分别为45%和44%.在230℃下经90min退火处理后的样品具有最佳的GMI效应,在8.5MHz的频率下,最大纵向和横向巨磁阻抗比分别达到251%和277%.与磁性层总厚度相同的FeCuCrVSiB Ag FeCuCrVSiB三层膜相比较,在这种多层结构中出现的GMI效应更强.
