Spin wave resonances in La_{0.7}Sr_{0.3}MnO_{3} films: measurement of spin wave stiffness and anisotropy field

TL;DR

This study investigates the magnetic properties of La_{0.7}Sr_{0.3}MnO_{3} films through microwave absorption, determining spin-wave stiffness and anisotropy field, and compares results with neutron scattering data.

Contribution

The paper provides experimental measurements of spin-wave stiffness and anisotropy field in La_{0.7}Sr_{0.3}MnO_{3} films using microwave spectroscopy, linking thin film and bulk properties.

Findings

Spin-wave stiffness measured aligns with neutron scattering results.

Angular and temperature dependence reveal magnetic anisotropy.

Microwave absorption effectively probes spin dynamics in manganite films.

Abstract

We studied magnetic field dependent microwave absorption in epitaxial La$_{0.7}$Sr$_{0.3}$MnO$_{3}$ films using an X-band Bruker ESR spectrometer. By analyzing angular and temperature dependence of the ferromagnetic and spin-wave resonances we determine spin-wave stiffness and anisotropy field. The spin-wave stiffness as found from the spectrum of the standing spin-wave resonances in thin films is in fair agreement with the results of inelastic neutron scattering studies on a single crystal of the same composition [Vasiliu-Doloc et al., J. Appl. Phys. \textbf{83}, 7343 (1998)].