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Abstract:
Here we report on the realization of tuning the intrinsic damping in the
half-metallic Heusler compound Co2MnSi by substituting Co by Ir. The
work includes theoretical calculations and experimental measurements on
bulk and thin films samples. Control of damping is to remove unwanted
magnetization motion and suppress signal echoes through uncontrolled
precession of the magnetization for future implementation of this
material into, e.g., current perpendicular plane-giant-magnetoresistance
sensors. Density functional calculations revealed stable magnetization
and increasing damping parameter with Iridium concentration, whereas the
half metallicity could be retained. The calculations are consistent with
experimental results from bulk and thin film samples of this report and
elucidate the linear dependence of the Gilbert damping parameter on the
substituent concentration. This report again demonstrates the inherent
tunability of Heusler compounds, which constitutes a pivotal feature of
this material class.
