XMCD characterization of rare-earth dopants in Ni$_{81}$Fe$_{19}$(50nm): microscopic basis of engineered damping
| dc.creator | Bailey, W. E. | |
| dc.creator | Cheng, L. | |
| dc.creator | Song, H. | |
| dc.date | 2004-03-25 | |
| dc.date.accessioned | 2026-07-07T02:57:15Z | |
| dc.date.available | 2026-07-07T02:57:15Z | |
| dc.description | We present direct evidence for the contribution of local orbital moments to the damping of magnetization precession in magnetic thin films. Using x-ray magnetic circular dichroism (XMCD) characterization of rare-earth (RE) M$_{4,5}$ edges in Ni$_{81}$Fe$_{19}$ doped with $<$ 2% Gd and Tb, we show that the enhancement of GHz precessional relaxation is accompanied by a significant orbital moment fraction on the RE site. Tb impurities, which enhance the Landau-Lifshitz(-Gilbert) LL(-G) damping $λ(α)$, show a spin to orbital number ratio of 1.5$\pm$0.3; Gd impurities, which have no effect on damping, show a spin to orbital number ratio of zero within experimental error. The results indicate that the dopant-based control of magnetization damping in RE-doped ferromagnets is an atomistic effect, arising from spin-lattice coupling, and thus scalable to nanometer dimensions. | |
| dc.description | 4 pages, 2 figures | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0403627 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0403627 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/23595 | |
| dc.subject | Materials Science | |
| dc.title | XMCD characterization of rare-earth dopants in Ni$_{81}$Fe$_{19}$(50nm): microscopic basis of engineered damping | |
| dc.type | text |