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

Abstract

We investigated temperature and magnetic field dependent radio-frequency electromagnetic absorption in La0.67Ba0.33MnO3 by monitoring changes in resonance frequency (fr) and current (II) through a LC resonant circuit powered by an integrated chip oscillator. The ferromagnetic to paramagnetic transition at Tc in zero external 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 delfr/fr and 23% in delI/I around Tc under H = 0.1 T that can be exploited for low magnetic field sensors and other applications.

12 pages, 5 figures

References in corpus (4)

• Radio-frequency impedance measurements using a tunnel-diode oscillator (TDO) technique
• Giant magnetic-field changes in radio-frequency absorption in La${}_{0.67}$Sr${}_{0.33}$MnO${}_3$ near the Curie temperature
• Nonresonant microwave absorption in epitaxial La-Sr-Mn-O films and its relation to colossal magnetoresistance
• A new method for direct rf power absorption studies in CMR materials and high T_c superconductors

Cited by in corpus (2)

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