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Title: Huge ac magnetoresistance of La0.7 Sr0.3 MnO 3 in subkilogauss magnetic fields
Authors: Rebello, A.
Naik, V.B.
Mahendiran, R. 
Issue Date: 2009
Citation: Rebello, A., Naik, V.B., Mahendiran, R. (2009). Huge ac magnetoresistance of La0.7 Sr0.3 MnO 3 in subkilogauss magnetic fields. Journal of Applied Physics 106 (7) : -. ScholarBank@NUS Repository.
Abstract: We report the electrical and magnetotransport behavior of a ferromagnetic metallic oxide, La0.7 Sr0.3 MnO3, in response to radio frequency current passing through the sample. We have studied the temperature dependence of the ac resistance (R) and inductive reactance (X) under different dc bias magnetic fields (Hdc =0-1 kOe) for different frequencies (f) of radio frequency current from f=0.1 to 5 MHz. The zero field R, which decreases smoothly around the Curie temperature TC for f=100 kHz, transforms into a peak for f=0.5-5 MHz. The peak decreases in amplitude, broadens, shifts downward in temperature as the bias field increases, and is completely suppressed under Hdc=1 kOe when f=0.5 MHz. The ac magnetoresistance and magnetoinductance exhibit a peak close to the T C. A huge low-field ac magnetoresistance (Δ R/R=40%) and magnetoinductance (ΔX/X=12%) are found in a field of Hdc =700 Oe and f=2 MHz. It has been suggested that the observed ac magnetoresistance has its origin in the suppression of spin fluctuation near TC and the enhancement of magnetic skin depth under the external magnetic field. The huge ac magnetoresistance reported in this work can be exploited for magnetic field sensors and other applications. © 2009 American Institute of Physics.
Source Title: Journal of Applied Physics
ISSN: 00218979
DOI: 10.1063/1.3223535
Appears in Collections:Staff Publications

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