Tuning of the Magnetic Damping Parameter by Varying Cr Composition in Fe1–xCrx Alloy*Supported by the National Key Research and Development Program of China (Grant No. 2016YFA0300803), the National Natural Science Foundation of China (Grant Nos. 61427812 and 11774160), the Natural Science Foundation of Jiangsu Province of China (Grant No. BK20192006), the Fundamental Research Funds for the Central Universities (Grant No.

Abstract

We investigate the magnetic damping parameter of Fe1 – xCrx thin films using the time-resolved magneto-optical Kerr effect technique. It is demonstrated that the overall effective damping parameter is enhanced with the increasing Cr concentration. The effective damping at high field α0 is found to be significantly enhanced when increasing the Cr concentration with the α0 = 0.159 in the Fe45Cr55 enhanced by 562% compared with that of α0 = 0.024 in the pure Fe film. This study provides a new approach of controlling the effective damping parameter with a desired magnitude via varying Cr composition.