2005 Volume 46 Issue 6 Pages 1261-1263
In the present work the sample length dependence of giant magnetoimpedance for Fe84Zr2.08Nb1.92Cu1B11 nanocrystalline ribbons was investigated. With a reduction of sample length L, the peak field HP of positive magnetoimpedance increases, due to an enhancement of demagnetization effect along the sample length direction. Meanwhile, a shortening of ribbon length brings about a decrease of the permeability change under field, which results in a drop of negative magnetoimpedance. In addition, the frequency fmax where the maximum of negative (ΔZ⁄Z0)max occurs, shifts to higher frequencies with reduction of sample length. The giant magnetoimpedance in nanocrystalline ribbons depends not only on the field and frequency, but also sensitively on the sample length, which should be considered in designing of GMI electronic circuits.