摘要
用4294A型阻抗分析仪研究Fe基纳米晶薄带(FNR)两种驱动模式(LC模式和L模式)的磁阻抗,发现LC模式阻抗频谱在外磁场作用下有显著的频移现象.利用这种频移现象,在选择LC模式的情况下,当驱动电流频率接近0磁场阻抗频谱峰频率时,磁阻抗比值达到24.28,比L模式的0.28大得多;磁敏线性区间为0～1 669.5 A/m,比L模式的0～70 A/m扩大20多倍.该结果在实际应用中有利于提高FNR磁敏传感器的灵敏度和扩大磁敏线性区间;用原子力显微镜(AFM)观察FNR表面和经氢氟酸溶液腐蚀的FNR结构表明,FNR内部存在10～30 nm的晶粒被非晶成分胶联的结构,这是FNR在LC驱动模式下具有显著磁致频移现象的内在因素.
Magnetoimpedances of Fe-based nanocrystalline ribbon (FNR) in both LC-and L-modes were investigated by 4294A impedance analyzer. A marked frequency shift (MFS) of impedance spectra was found in the external magnetic field with LC-mode. This character was utilized for enhancing the magnetoimpedance. When the driving current frequency approximated the frequency at the peak of impedance spectra with LC-mode under zero external magnetic field, the magnetoimpedance ratio and magnetic sensitive linear range with LC-mode were 24.28 and 0-1669.5 A/m, which are much larger than 0.28 and 0-70 A/m with L-mode, respectively. The results show that the FNR in LC-mode can be used as potential magnetic sensitive sensor. The mesostructure, nanocrystalline grains of 10-30 nm linked up with amorphous composition, in FNR, was detected by atomic force microscopy (AFM). This structure is an inner factor of the MFS.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2005年第4期511-515,521,共6页
Journal of Zhejiang University：Engineering Science
基金
浙江省自然科学基金资助项目(602147)
教育部科学技术研究重点资助项目(204059)
浙江省青年科技人员专项基金资助项目(RC02069)
浙江省科技计划资助项目(2003C31007).
关键词
Fe基纳米晶
频移
磁阻抗
介观结构
Atomic force microscopy
Frequency shift keying
Iron compounds
Magnetic field effects
Microstructure
Nanostructured materials
