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Instruments / Technical Area	Publication Details	Published	Actions
I06-Nanoscience	Scaling of spin relaxation and angular momentum dissipation in permalloy nanowires T. Moore , M. Klaui , L. Heyne , P. Mohrke , D. Backes , J. Rhensius , U. Rudiger , L. Heyderman , J.-u. Thiele , G. Wolterstorf , C. Back , A. Fraile Rodriquez , F. Nolting , T. Mentes , M. Nino , A. Locatelli , S. Dhesi , S. Cavill , H. Marchetto , A. Potenza Physical Review B 80 (13), 132403 DOI: 10.1103/PhysRevB.80.132403 Show Abstract ▼ Abstract: We study the relationship between the damping (alpha) and the nonadiabaticity of the spin transport (beta) in permalloy nanowires. alpha is engineered by Ho doping, and from the characteristics of the current-induced domain-wall velocity, determined by high-resolution x-ray magnetic circular-dichroism photoemission electron microscopy, beta due to spin relaxation is measured. We find that beta scales with alpha and conclude that the spin relaxation that leads to nonadiabatic spin torque originates from the same underlying mechanism as the angular momentum dissipation that causes viscous damping.	Oct 2009
I06-Nanoscience	Domain wall velocity measurement in permalloy nanowires with X-ray magnetic circular dichroism imaging and single shot Kerr microscopy T. A. Moore , M. Klaui , L. Heyne , P. Möhrke , D. Backes , J. Rhensius , U. Rüdiger , L. J. Heyderman , T. O. Mentes , M. A. Niño , A. Locatelli , A. Potenza , S. S. Dhesi , S. Cavill , H. Marchetto Journal Of Magnetism And Magnetic Materials DOI: 10.1016/j.jmmm.2009.06.048 Show Abstract ▼ Abstract: Domain walls (DWs) propagated along nanoscale magnetic wires by current or field pulses could potentially be used for data storage or logic applications, but the understanding of the DW dynamics, particularly under the influence of spin-polarized current, is incomplete. Measuring the velocity can give insights into the physics of the DW motion. Here we demonstrate DW velocity measurements in permalloy (Ni80Fe20Ni80Fe20) nanowires (1500 nm width and 20 nm thickness) using the techniques of X-ray magnetic circular dichroism photoemission electron microscopy (XMCD-PEEM) to image the magnetic contrast in the nanowires, and single shot Kerr microscopy, which allows for dynamic measurements. The magnetic imaging yields the average velocity as well as information on the DW spin structure, whereas the single shot method highlights the stochastic nature of the DW motion.	Jun 2009

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