Low damping and small inhomogeneous linewidth broadening in Co2FeAl films

Abstract In this work we investigate structural, static and dynamics magnetic properties of Co 2 FeAl (CFA) films, deposited on Si (100) with Ti buffer and capping layers. We study the evolution of the coercive field, anisotropies, damping constant and linewidth broadening as a function of CFA film thickness in the range 5 nm to 200 nm. We obtain coercive fields weakly dependent on thickness, with values in the range 4.2 Oe to 7.8 Oe. All samples show roughly constant in-plane magnetic anisotropy, and out-plane anisotropy originated from the CFA/Ti interfaces. With increasing thickness we observe the emergence of rotatable anisotropy. We found magnetic damping parameters α between 2.56 × 10 - 3 and 3.45 × 10 - 3 , and inhomogeneous linewidth Δ H o under 10.3 Oe for the whole range of CFA film thickness. These Δ H 0 results are small when compared to the values reported for CFA in literature, specially for films with thickness above 100 nm. The present study contributes to a better understanding of the dynamic properties of magnetic CFA films, and open new potential applications in magneto-impedance sensors, RF shielding and others.