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- W2079257178 abstract "Abstract We report the ac electrical response of La0.7Sr0.3Mn1−xFexO3 ( x = 0.05 ) as a function of temperature, magnetic field ( H ) and frequency of radio frequency ( r f ) current ( f = 0.1 – 20 MHz ). The ac impedance ( Z ) was measured while rf current directly passes through the sample as well as in a coil surrounding the sample. It is found that with increasing frequency of the rf current, Z ( T ) shows an abrupt increase accompanied by a peak at the ferromagnetic Curie temperature. The peak decreases in magnitude and shifts down with increasing value of H . We find a magnetoimpedance of Δ Z / Z = − 21 % for Δ H = 500 Oe at f = 1 MHz around room temperature when the rf current flows directly through the sample and Δ Z / Z = − 65.9 % when the rf current flows through a coil surrounding the sample. It is suggested that the magnetoimpedance observed is a consequence of suppression of transverse permeability which enhances skin depth for current flow. Our results indicate that the magnetic field control of high frequency impedance of manganites is more useful than direct current magnetoresistance for low-field applications." @default.
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- W2079257178 date "2011-12-01" @default.
- W2079257178 modified "2023-10-16" @default.
- W2079257178 title "Ac magnetotransport in La0.7Sr0.3Mn0.95Fe0.05O3 at low dc magnetic fields" @default.
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- W2079257178 doi "https://doi.org/10.1016/j.ssc.2011.09.007" @default.
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