Quadratic scaling of intrinsic Gilbert damping with spin-orbital coupling in L10 FePdPt films: experiments and Ab initio calculations

• Published in: Physical review letters Vol. 110; no. 7; p. 077203
• Main Authors: He, P, Ma, X, Zhang, J W, Zhao, H B, Lüpke, G, Shi, Z, Zhou, S M
• Format: Journal Article
• Language: English
• Published: United States 15.02.2013
• ISSN: 1079-7114
• DOI: 10.1103/PhysRevLett.110.077203

The dependence of the intrinsic Gilbert damping parameter α(0) on the spin-orbital coupling strength ξ is investigated in L1(0) ordered FePd(1-x) Pt(x) films by time-resolved magneto-optical Kerr effect measurements and spin-dependent ab initio calculations. Continuous tuning of α(0) over more than one order of magnitude is realized by changing the Pt/Pd concentration ratio showing that α(0) is proportional to ξ(2) as changes of other leading parameters are found to be negligible. The perpendicular magnetic anisotropy is shown to have a similar variation trend with x. The present results may facilitate the design and fabrication of new magnetic alloys with large perpendicular magnetic anisotropy and tailored damping properties.