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Instruments / Technical Area	Publication Details	Published
I06-Nanoscience	Magnetic-field-induced domain-wall motion in permalloy nanowires with modified Gilbert damping Thomas Moore , Phillipe Mohrke , Lutz Heyne , Andreas Kaldun , Mathias Kläui , Dirk Backes , Jan Rhensius , Laura Heyderman , Jan-ulrich Thiele , Georg Woltersdorf , Arantxa Rodriguez , Frithjof Nolting , Tevfik Mentes , Miguel Nino , Andrea Locatelli , Alessandro Potenza , Helder Marchetto , Stuart Cavill , Sarnjeet Dhesi Physical Review B 82 (9) DOI: 10.1103/PhysRevB.82.094445 Show Abstract ▼ Abstract: Domain wall (DW) depinning and motion in the viscous regime induced by magnetic fields, are investigated in planar permalloy nanowires in which the Gilbert damping is tuned in the range 0.008–0.26 by doping with Ho. Real time, spatially resolved magneto-optic Kerr effect measurements yield depinning field distributions and DW mobilities. Depinning occurs at discrete values of the field which are correlated with different metastable DW states and changed by the doping. For α<0.033, the DW mobilities are smaller than expected while for α>=0.033, there is agreement between the measured DW mobilities and those predicted by the standard one-dimensional model of field-induced DW motion. Micromagnetic simulations indicate that this is because as increases, the DW spin structure becomes increasingly rigid. Only when the damping is large can he DW be approximated as a pointlike quasiparticle that exhibits the simple translational motion predicted in the viscous regime. When the damping is small, the DW spin structure undergoes periodic distortions that lead to a velocity reduction. We therefore show that Ho doping of permalloy nanowires enables engineering of the DW depinning and mobility, as well as the extent of the viscous regime.	Sep 2010
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
	Double-resonant x-ray and microwave absorption: Atomic spectroscopy of precessional orbital and spin dynamics G. Boero , S. Rusponi , P. Bencok , R. Meckenstock , J-u. Thiele , F. Nolting , P. Gambardella Physical Review B DOI: 10.1103/PhysRevB.79.224425 Show Abstract ▼ Abstract: We show that double-resonance spectra recorded during the simultaneous absorption of x-ray and microwave (MW) photons are a fingerprint of the perturbed electronic configuration of atomic species driven to ferromagnetic resonance. X-ray absorption measurements performed as a function of x-ray energy and polarization over the Fe?L 2,3 edges of single-crystal yttrium-iron garnet reveal MW-induced multiplet features related to angular momentum transfer from the MW field to localized Fe?3d magnetic sublevels. O?K -edge absorption spectra demonstrate the formation of dynamic 2p -orbital magnetization components at O sites coupled to the Fe magnetic moments at tetrahedral and octahedral sites. These results are compared with double-resonance x-ray absorption spectra of Permalloy, showing that the MW transition probability is distributed according to the hybridization character of the 3d states and proportional to the unperturbed unoccupied magnetic density of states of metals and insulators.	Jun 2009

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