Brillouin light scattering study of Co${}_2$Cr${}_{0.6}$Fe${}_{0.4}$Al and Co${}_2$FeAl Heusler compounds

Abstract

The thermal magnonic spectra of Co${}_2$Cr${}_{0.6}$Fe${}_{0.4}$Al (CCFA) and Co${}_2$FeAl were investigated using Brillouin light scattering spectroscopy (BLS). For CCFA, the exchange constant A (exchange stiffness D) is found to be 0.48 $\mu$erg/cm (203 meV A${}^2$), while for Co${}_2$FeAl the corresponding values of 1.55 $\mu$erg/cm (370 meV A${}^2$) were found. The observed asymmetry in the BLS spectra between the Stokes and anti-Stokes frequencies was assigned to an interplay between the asymmetrical profiles of hybridized Damon-Esbach and perpendicular standing spin-wave modes, combined with the optical sensitivity of the BLS signal to the upper side of the CCFA or Co${}_2$FeAl film.

References in corpus (4)

• Calculated electronic and magnetic properties of the half-metallic, transition metal based Heusler compounds
• Electronic structure and spectroscopy of the quaternary Heusler alloy Co${}_2$Cr${}_{1-x}$Fe${}_x$Al
• Magnetic anisotropies and magnetization reversal of the Co${}_2$Cr${}_{0.6}$Fe${}_{0.4}$Al Heusler compound
• Intensity of Brillouin light scattering from spin waves in magnetic multilayers with noncollinear spin configurations: Theory and experiment