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Topic Area: Nanomagnetics

Displaying records 51 to 60 of 201 records.
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51. Exchange Coupling in Magnetic Multilayers
Topic: Nanomagnetics
Published: 5/1/2006
Author: Mark D Stiles
Abstract: In magnetic multilayers, the magnetizations of two ferromagnetic layers separated by a non-magnetic spacer layer are coupled by the electrons in the spacer layer. This coupling oscillates in sign as a function of the thickness of the spacer layer. Ex ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620567

52. The Effect of Stress Induced Anisotropy in Patterned FeCo Thin Film Structures
Topic: Nanomagnetics
Published: 4/24/2006
Authors: W Yu, J A Bain, Willard C Uhlig, John Unguris
Abstract: In this work, 1 {mu}m thick FeCeo films with {math minus}320 MPa compressive stress and FeCo/NiFe films with 600 MPa tensile stress were patterened into 5{mu}m x 20 {mu}m elements. The stress anisotropy resulting from patterning was measured using x ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620575

53. Size Dependent Transition from Shape to Exchange Dominated Magnetic Nanostructures in Patterned Zigzags
Topic: Nanomagnetics
Published: 4/17/2006
Authors: Willard C Uhlig, John Unguris
Abstract: In order to quantitatively investigate the interplay between shape anisotropy (magnetostatics) and exchange, patterned zigzag structures were prepared with sizes varying over two orders of magnitude. The magnetic state is a balance between shape anis ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620573

54. Suppression of Orange-Peel Coupling in Magnetic Tunnel Junctions by Preoxidation
Topic: Nanomagnetics
Published: 4/17/2006
Authors: William F. Egelhoff Jr., Robert D McMichael, Cindi L Dennis, Mark D Stiles, Alexander J. Shapiro, Brian B. Maranville, Cedric John Powell
Abstract: We have found that preoxidation of the bottom Co electrode in magnetic tunnel junctions (MTJs) very effectively suppresses orange-peel coupling. The result is a free layer that is much softer. Work by others has demonstrated that preoxidation is com ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620584

55. Spin Transfer Torque for Continuously Variable Magnetization
Topic: Nanomagnetics
Published: 2/21/2006
Authors: J Xiao, A Zangwill, Mark D Stiles
Abstract: We report quantum and semi-classical calculations of spin current and spin-transfer torque in a free-electron Stoner model for systems where the magnetization varies continuously in one dimension. Analytic results are obtained for an infinite spin sp ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620577

56. Current Induced DomainWall Distortions
Topic: Nanomagnetics
Published: 1/1/2006
Authors: Willard C Uhlig, John Unguris
Abstract: We have directly imaged the spin transfer torque induced distortion of domain walls in current carrying ferromagnetic wires. Domain walls ranging from vortex walls in wide (1 m) wires, to transverse walls in narrow (100 nm) wires were studied. Scann ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620005

57. Spin Transport for Spin Diffusion Lengths Comparable to Mean Free Paths
Topic: Nanomagnetics
Published: 12/15/2005
Authors: David R. Penn, Mark D Stiles
Abstract: In perpendicular-transport structures with magnetic and non-magnetic layers, there is a resistance associated with changes in the value of current polarization throughout the structure. Starting from a Boltzmann equation Valet and Fert derived macros ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620574

58. Macrospin Models of Spin Transfer Dynamics
Topic: Nanomagnetics
Published: 7/1/2005
Authors: J Xiao, A Zangwill, Mark D Stiles
Abstract: The current-induced magnetization dynamics of a spin valve are studied using a macrospin (single-domain) approximation and numerical solutions of a generalized Landau-Lifshitz-Gilbert equation. For the purpose of quantitative comparison to experiment ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620572

59. Current-induced switching in a single exchange-biased ferromagnetic layer
Topic: Nanomagnetics
Published: 5/15/2005
Authors: Tingyong Chen, Yi Ji, C Chien, Mark D Stiles
Abstract: We demonstrate current-induced switching effects in a single exchanged-biased ferromagnetic layer. A nanodomain can be switched within the ferromagnetic layer by a spin polarized current injected through a point contact. The high resistance of the hy ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620570

60. Magnetic normal modes of nano-elements
Topic: Nanomagnetics
Published: 5/15/2005
Authors: Robert D McMichael, Mark D Stiles
Abstract: Micromagnetic calculations are used to determine the eigenfrequencies and precession patterns of some of the lowest-frequency magnetic normal modes of submicron patterned elements. For a Permalloy-like ellipse, 350 nm ¿ 160 nm ¿ 5 nm th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620564