Session Y4: Microscopic Physics of Magnetization Damping

8:00 AM–11:00 AM, Friday, March 19, 2010
Room: Oregon Ballroom 204

Chair: Olle Heinonen, Seagate Technology-Stillwater

Abstract ID: BAPS.2010.MAR.Y4.2

Abstract: Y4.00002 : Ab-initio study of the resistivity, Gilbert damping and spin-flip diffusion in transition metal alloys

8:36 AM–9:12 AM

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Author:

Paul Kelly
(University of Twente)

Using a formulation of first-principles scattering theory that includes disorder and spin-orbit coupling on an equal footing, we calculate the resistivity $\rho$, spin-flip diffusion length $\lambda _{sf}$ and the Gilbert damping parameter $\alpha$ for Fe$_{x}$Ni$_{1-x}$ substitutional alloys as a function of x over the entire concentration range. For the technologically very important Fe$_{20}$Ni$_{80}$ alloy, permalloy, we calculate values of $\rho$ = 3.7$\pm$0.5 Ohm-cm, $\lambda _{sf}$ = 5.2$\pm$0.2 nm and $\alpha$ = 0.0046$\pm$0.002 compared to experimental low-temperature values in the range 4.4-5.1 Ohm-cm for $\rho$, 5.0-6.0 nm for $\lambda _{sf}$ and 0.005-0.009 for $\alpha$ indicating that our scattering theoretical formulation captures the most important contributions to these parameters. Work carried out with A.A. Starikov in collaboration with A. Brataas, Y. Tserkovnyak and G.E.W. Bauer.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.MAR.Y4.2