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

TL;DR

This study explores how the radio-frequency electromagnetic absorption in La0.67Ba0.33MnO3 varies with temperature and magnetic field, revealing tunable properties useful for sensor applications.

Contribution

It demonstrates magnetic field tuning of rf wave absorption in La0.67Ba0.33MnO3 near its transition temperature, with significant fractional changes in resonance frequency and current.

Findings

Fractional change of 46% in resonance frequency near Tc

Fractional change of 23% in circuit current under 0.1 T magnetic field

Tunable rf absorption properties suitable for low-field sensors

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.