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You searched on: Topic Area: Nanomagnetics

Displaying records 51 to 60 of 220 records.
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51. 'Ballistic' vs. 'Diffusive' Transport in Current-Induced Magnetization Switching
Topic: Nanomagnetics
Published: 12/21/2007
Authors: N Theodoropoulou, A Sharma, W Pratt, J. Bass, Mark D Stiles, J Xiao
Abstract: We test whether current-induced magnetization switching due to spin-transfer-torque in ferromagnetic/non-magnetic/ferromagnetic (F/N/F) trilayers changes significantly when scattering within the N-metal layers is changed from ballistic to diffusive. ...

52. A Numerical Method to Solve the Boltzmann Equation for a Spin Valve
Topic: Nanomagnetics
Published: 10/1/2007
Authors: J Xiao, A Zangwill, Mark D Stiles
Abstract: We present a numerical algorithm to solve the Boltzmann equation for the electron distribution function in magnetic multilayer heterostructures with non-collinear magnetizations. The solution is based on a scattering matrix formalism for layers that ...

53. Theory of Spin Transfer Torque
Topic: Nanomagnetics
Published: 9/1/2007
Author: Mark D Stiles
Abstract: In magnetic multilayers, the spin polarized currents flowing between the magnetic layers can exert torques on the magnetizations of the layers when the magnetizations are not collinear. The theory of these spin transfer torques is developed in term ...

54. Manipulation of the Vortex Motion in Nanostructured Ferromagnetic/Superconductor Hybrids
Topic: Nanomagnetics
Published: 4/30/2007
Authors: A V Silhanek, W Gillijns, V V Moshchalkov, V Metlushko, F Gozzini, B Ilic, Willard C Uhlig, John Unguris
Abstract: The authors investigate the rectified motion of vortices in superconducting films deposited on top of a close-packed array of open in-plane magnetized triangular micromagnets. The dc voltage induced by the vortex drift under an ac excitation is reco ...

55. Adiabatic Domain Wall Motion and Landau-Lifshitz Damping
Topic: Nanomagnetics
Published: 1/1/2007
Authors: Mark D Stiles, Wayne M. Saslow, Michael J Donahue, A Zangwill
Abstract: 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 mag ...

56. Identification of the dominant precession damping mechanism in Fe, Co, and Ni by first-principles calculations
Topic: Nanomagnetics
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 ...

57. Implementation of a Non-Equilibrium Green's Function Method to Calculate Spin Transfer Torque
Topic: Nanomagnetics
Published: 1/1/2007
Authors: Christian Heiliger, M Czerner, B Yavorsky, I Mertig, Mark D Stiles
Abstract: We present an implementation of the steady state Keldysh approach in a Green function multiple scattering scheme to calculate the non-equilibrium spin density. This density is used to obtain the spin transfer torque in junctions showing the magneto r ...

58. SEMPA Imaging for Spintronics Applications
Topic: Nanomagnetics
Published: 1/1/2007
Authors: John Unguris, Daniel Thornton Pierce, Seok-Hwan Chung
Abstract: Scanning Electron Microscopy with Polarization Analysis (SEMPA) provides high resolution (10 nm) magnetization images simultaneously with, but independent of, the topography. Such information is very useful in studying spintronics devices as illustr ...

59. Spin-Orbit Precession Damping in Transition Metal Ferromagnets
Topic: Nanomagnetics
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 ...

60. Tunneling Magnetoresistance With Amorphous Electrodes
Topic: Nanomagnetics
Published: 1/1/2007
Authors: M Gradhand, Christian Heiliger, P Zahn, I Mertig
Abstract: A detailed first principles analysis of the transport properties of different magnetic electrode materials for MgO tunnel junctions is performed to elucidate the microscopic origin of the TMR effect. The spin-dependent transport properties of the mag ...

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