Magnetically tunable rf wave absorption in polycrystalline La0.67Ba0.33MnO3

Naik, V. B.; Mahendiran, R.
April 2009
Applied Physics Letters;4/6/2009, Vol. 94 Issue 14, p142505
Academic Journal
We investigated temperature and magnetic field dependent radio-frequency electromagnetic absorption in La0.67Ba0.33MnO3 by monitoring changes in resonance frequency (fr) and current (I) through a LC resonant circuit powered by an integrated chip oscillator. The ferromagnetic to paramagnetic transition at TC in zero magnetic field is accompanied by an abrupt increase in fr and I and they are tunable by small external magnetic field. We observed fractional changes as much as 46% in Δfr/fr and 23% in ΔI/I around TC under μ0H=0.1 T that can be exploited for low-magnetic field sensors and other applications.


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