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/content/aip/journal/adva/6/5/10.1063/1.4943244
2016-03-01
2016-09-25

Abstract

We report the magnetic field dependence of electrical impedance Z in polycrystalline LaBaMnO a function of frequency from = 1 MHz to 1 GHz at room temperature. The magnetoimpedance [ = ΔZ/Z(0) where ΔZ = (H)-(0)] is −37.5 % (-58.5%) at 1(10) MHz for = 1.2 kOe, which far exceeds mere -1.15% dc magnetoresistance. As increases above 10 MHz, decreases in magnitude and changes sign from negative to positive. The change in sign of results from the transition of a single peak at = 0 to two peaks at = ± accompanied by a minimum at the origin. shifts towards higher field with increasing frequency. The occurrence of giant radio-frequency magnetoimpedance is promising for low-field sensor applications.

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