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

Rebello, A.; Mahendiran, R.
January 2010
Applied Physics Letters;1/18/2010, Vol. 96 Issue 3, p032502
Academic Journal
We show that ac magnetoresistance at room temperature in La0.7Sr0.3MnO3 is extremely high (≈-47% in μ0H=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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