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采用单辊快淬法制备了Fe_(75)Si_9B_(13)非晶薄带。磁阻抗测试显示,淬态非晶FeSiB合金薄带具有显著的巨磁阻抗效应(GMI),在7 MHz频率下,纵横向最大阻抗比分别达到30%和29%。磁畴结构观察表明,薄带样品磁畴结构为具有一定的横向取向的180°条形畴,易轴与样品横向夹角约为75°。磁电阻变化与样品各向异性变化没有直接关系,相比磁阻抗,磁感抗更确切地反映了磁矩转动磁化行为和样品各向异性场的大小,易轴具有一定的横向取向以及薄带各向异性在厚度方向的空间分布是影响其GMI变化特性的原因。分析了磁电阻、磁感抗对样品巨磁阻抗效应的影响,发现,低频下,磁电阻对磁阻抗变化起主要作用,随着趋肤效应增强,样品磁感抗逐渐成为影响磁阻抗变化行为的主要方面。
Fe (75) Si_9B_ (13) amorphous ribbons were prepared by single roll rapid quenching method. Magneto-impedance tests show that the quenched amorphous FeSiB alloy ribbons have significant giant magneto-impedance effect (GMI) of 30% and 29% at 7 MHz respectively. The magnetic domain structure observation shows that the magnetic domain structure of the ribbon sample is a 180 ° strip-shaped domain with a certain transverse orientation, and the angle between the easy axis and the sample transverse direction is about 75 °. Magnetic resistance change is not directly related to the change of anisotropy of the sample. Compared with the magnetic resistance, the magnetic induction more accurately reflects the magnetization of the magnetic moment and the size of the anisotropy field of the sample. The easy axis has a certain lateral orientation and a thin band The spatial distribution of anisotropy in the thickness direction is the reason for the change of GMI. The influence of magnetoresistance and magneto-inductive reactance on the giant magneto-impedance effect is analyzed. It is found that magnetoresistance plays a major role in the change of magneto-impedance at low frequencies. With the enhancement of skin effect, the magneto-inductive reactance of sample gradually becomes the influence of magneto-impedance variation The main aspects.