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Publication Citation: Impact of Gd dopants on current polarization and the resulting effect on spin-transfer velocity in Permalloy wires

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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: PDF Document Click here to retrieve PDF version of paper (536KB)