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1. Anisotropic damping of the magnetization dynamics in Fe, Ni and Co
Published: 5/17/2010
Authors: Daniel Steiauf, Jonas Seib, Manfred Faehnle, Keith Gilmore, Mark D Stiles
Abstract: The Gilbert parameter alpha describing the damping of magnetization dynamics is commonly taken to be an isotropic scalar. We argue that it is a tensor, that is anisotropic, leading to a dependence of the damping on both the instantaneous direction ...

2. Evaluating the locality of intrinsic precession damping in transition metals
Published: 4/24/2009
Authors: Keith Gilmore, Mark D Stiles
Abstract: The Landau-Lifshitz-Gilbert damping parameter is typically assumed to be a local quantity, independent of the magnetic configuration. To test the validity of this assumption we calculate the precession damping rate of small amplitude non-uniform mod ...

3. First-Principles Calculation of the Non-Adiabatic Spin Transfer Torque in Ni and Fe
Published: 12/16/2011
Authors: Keith Gilmore, Ion Garate, Allan H. MacDonald, Mark D Stiles
Abstract: The magnetization dynamics of a ferromagnet subjected to an electrical current are given by an extension of the Landau-Lifshitz-Gilbert equation that contains two additional terms, the adiabatic and non-adiabatic spin-transfer torques. First-prin ...

4. Identification of the dominant precession damping mechanism in Fe, Co, and Ni by first-principles calculations
Published: 1/1/2007
Authors: Keith Gilmore, Y Idzerda, Mark D Stiles
Abstract: The Landau-Lifshitz equation reliably describes magnetization dynamics using a phenomenological treatment of damping. This paper presents first-principles calculations of the damping parameters for Fe, Co, and Ni that quantitatively agree with exist ...

5. Large-scale core-level Bethe-Salpeter equation calculations
Published: 8/31/2015
Authors: Keith Gilmore, John Thomas Vinson, Eric L Shirley, David Prendergast, C. D. Pemmaraju, Josh J Kas, John J Rehr, Fernando D Vila
Abstract: We present an efficient implementation of the Bethe-Salpeter equation (BSE) method for obtaining core-level spectra including x-ray absorption (XAS), x-ray emission (XES), and both resonant and non-resonant inelastic x-ray scattering spectra (N/R ...

6. Non-Adiabatic Spin Transfer Torque in Real Materials
Published: 3/16/2009
Authors: Ion Garate, Keith Gilmore, Mark D Stiles, Allan H. MacDonald
Abstract: The motion of simple domain walls and of more complex magnetic textures in the presence of a transport current is described by the Landau-Lifshitz-Slonczewski (LLS) equations. Predictions of the LLS equations depend sensitively on the ratio betwee ...

7. Spin-Orbit Precession Damping in Transition Metal Ferromagnets
Published: 1/1/2007
Authors: Keith Gilmore, Y Idzerda, Mark D Stiles
Abstract: We provide a simple explanation, based on an effective field, for the precession damping rate due to the spin-orbit interaction. Previous effective field treatments of spin-orbit damping include only variations of the state energies with respect to ...

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