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We report dynamical magnetotransport in a ferromagnetic metallic oxide,La0.7Sr0.3MnO3 using the ac impedance technique. The temperature dependence ofthe ac resistance(R) and the inductive reactance (X) of the complex impedance(Z = R+jX) under different dc bias magnetic fields (Hdc = 0-1 kOe) were studiedfor different frequencies f = 0.1 to 5 MHz of alternating current. The zerofield R, which decreases smoothly around the Curie temperature TC for f = 100kHz, transforms into a peak for f = 0.5-5 MHz. The peak decreases in amplitude,broadens and shifts downward in temperature as the bias field increases. A hugeac magnetoresistance (= 45 % at f = 2 MHz) in a field of Hdc = 1 kOe is foundand we attribute it to the magnetic field- induced enhancement in the skindepth and concomitant suppression of magnetic fluctuations near TC. Our studysuggests that radio frequency magnetotransport provides an alternative strategyto enhance the magnetoresistance and probe the spin-charge coupling inmanganites.

Huge ac magnetoresistance in La0.7Sr0.3MnO3 in sub- kilo gauss magnetic fields