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Search Publications by: Michael J. Donahue (Fed)

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Displaying 26 - 50 of 97

Reversal mechanisms in perpendicular magnetic nanostructures

July 16, 2008
Author(s)
Justin M. Shaw, Stephen E. Russek, Michael J. Donahue, Thomas Thomson, Bruce Terris, Michael Schneider, Miles Olsen
We find that the reversal mechanism in magnetic nanostructures is highly dependent on the nature and condition of the edges. Temperature and size dependent reversal properties of fabricated perpendicularly magnetized nanostructures down to 25 nm in

Numerical Micromagnetics: Finite Difference Methods

September 1, 2007
Author(s)
J. Miltat, Michael J. Donahue
Micromagnetics is based on the one hand on a continuum approximation of exchange interactions, including boundary conditions, on the other hand on Maxwell equations in the non-propagative (static) limit for the evaluation of the demagnetizing field. The

Adiabatic Domain Wall Motion and Landau-Lifshitz Damping

January 1, 2007
Author(s)
Mark D. Stiles, Wayne M. Saslow, Michael J. Donahue, A Zangwill
Recent theory and measurements of the velocity of current-driven domain walls in magnetic nanowires have re-opened the unresolved question of whether Landau-Lifshitz damping or Gilbert damping provides the more natural description of dissipative

Manipulation of magnetic particles by patterned arrays of magnetic spin-valve traps

December 20, 2006
Author(s)
Elizabeth Mirowksi, John M. Moreland, Stephen E. Russek, Michael J. Donahue
A novel magnetic for microfluidic manipulation of magnetic particles is discussed. The particles are confined by an array of magnetic spin valves with bistable ferromagnetic "ON" and antiferromagnetic "OFF" net magnetization states. The switchable fringing

Dynamic Susceptibility of Nanopillars

October 1, 2005
Author(s)
N Dao, I Dumitru, L Spinu, S L. Whittenburg, Michael J. Donahue, J C. Lodder
We have calculated dynamic susceptibility of patterned cobalt and Permalloy pillars with a diameter of 50 nm and different pillar heights using micromagnetic simulations. The resonance modes obtained from these simulations are compared to the results

Velocity of Transverse Domain Wall Motion Along Thin, Narrow Strips

June 1, 2004
Author(s)
Donald G. Porter, Michael J. Donahue
Micromagnetic simulation of domain wall motion in thin, narrow strips leads to a simplified analytical model. The model accurately predicts the same domain wall velocity as full micromagnetic calculations, including dependence on strip width, thickness