| Author(s): |
Rebecca L. Thomas; Meng Zhu; Cindi L. Dennis; Veena Misra; Robert D. McMichael; |
| Title: |
Impact of Gd dopants on current polarization and the resulting effect on spin-transfer velocity in Permalloy wires |
| Published: |
August 01, 2011 |
| Abstract: |
A spin-wave Doppler technique is used to measure the spin-transfer velocity and the current polarization in current-carrying (Ni80Fe20)1-xGdx alloy wires. Reduced magnetization values with Gd doping suggest possible increases in the spin-transfer velocity. Contrary to these expectations, we measured a decrease in the spin-transfer velocity upon introducing Gd dopants. For a current density of 1011 A/m2, the measured velocities range from 6.0 ± 0.6 m/s for pure Permalloy to 2.6 ± 0.3 m/s for (Ni80Fe20)94.5Gd5.5. Interpretation of these values yields a current polarization ranging from .71 ± .02 to .30 ± .01 for the same compositions. These results reveal that Gd dopants in Permalloy have a more significant impact on the current polarization than on the material’s magnetization for these alloy compositions. |
| Citation: |
Journal of Applied Physics |
| Volume: |
110 |
| Issue: |
3 |
| Pages: |
4 pp. |
| Keywords: |
nanomagnetics; spin; future electronics; spin waves; magnetism; |
| Research Areas: |
Nanomagnetics |
| PDF version: |
 Click here to retrieve PDF version of paper (524KB) |
