Volume 86, Number 2, April 2009
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||06 May 2009|
Unusual field dependence of radio frequency magnetoimpedance in La0.67Ba0.33MnO3
Department of Physics and NUS Nanoscience & Nanotechnology Initiative (NUSNNI), Faculty of Science, National university of Singapore - 2 Science Drive 3, Singapore 117542, Singapore
Corresponding author: firstname.lastname@example.org
Accepted: 30 March 2009
Magnetic-field dependence of the ac impedance in La0.67Ba0.33MnO3 carried out over a wide frequency range ( 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 = 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 = 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.
PACS: 75.47.Lx – Manganites / 72.15.Gd – Galvanomagnetic and other magnetotransport effects / 72.25.Ba – Spin polarized transport in metals
© EPLA, 2009
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