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Title: Unusual field dependence of radio frequency magnetoimpedance in La 0.67Ba0.33MnO3
Authors: Rebello, A.
Mahendiran, R. 
Issue Date: 2009
Citation: Rebello, A., Mahendiran, R. (2009). Unusual field dependence of radio frequency magnetoimpedance in La 0.67Ba0.33MnO3. EPL 86 (2) : -. ScholarBank@NUS Repository.
Abstract: Magnetic-field dependence of the ac impedance Z(f,H)=R(f,H)+jX(f, H) in La0.67Ba0.33MnO3 carried out over a wide frequency range (f=0 to 30 MHz) reveals a huge low-field ac magnetoresistance, ΔR/R=-55% at f=15 MHz and magnetoreactance, ΔX/X=-80% at f=3 MHz in μ0H=100 mT at room temperature. We show contrasting evolution of ΔR/R and ΔX/X with increasing magnetic field and frequency. While ΔR/R is negative and shows a single peak at μ0H=0 T for all but f=30 MHz, the single peak in ΔX/X transforms into a valley at the origin and a double peak at H=Hk which shifts upward in H with increasing frequency. The ΔX/X eventually changes sign from negative to positive above 25 MHz. The observed features in ΔX/X suggest possible occurrence of ferromagnetic resonance in MHz range. © EPLA, 2009.
Source Title: EPL
ISSN: 02955075
DOI: 10.1209/0295-5075/86/27004
Appears in Collections:Staff Publications

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