Influence of length and measurement geometry on magnetoimpedance in La0.7Sr0.3MnO3

Details Influence of length and measurement geometry on magnetoimpedance in La0.7Sr0.3MnO3 Influence of length and measurement geometry on magnetoimpedance in La0.7Sr0.3MnO3

2009-11-29

arxiv.org/abs/0911.5492v1

Physics

Condensed Matter

Materials Science

12 pages, 3 figures

Scientific paper

We show that ac magnetoresistance at room temperature in La0.7Sr0.3MnO3 is extremely high (= 47% in H = 100 mT, f = 3-5 MHz), and magnetic field dependence of reactance exhibits a double peak behavior. However, magnitudes of the ac magnetoresistance and magnetoreactance for a fixed length of the sample (li) decrease with decreasing separation (lv) between voltage probes unlike the dc magnetoresistance. On the contrary, change in li has a negligible influence on magnetoimpedance when lv is fixed. Our results indicate that high frequency electrical transport is sensitive to local variations in the magnetic permeability.

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