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Author: keith gilmore
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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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903652

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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901357

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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909728

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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620594

5. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901198

6. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620019



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