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Topic Area: Nanomagnetics

Displaying records 61 to 70 of 216 records.
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61. Preoxidation as a general approach to suppressing orange-peel coupling in magnetic tunnel junctions
Topic: Nanomagnetics
Published: 10/1/2006
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 electrode prior to deposition of Al^d2^O^d3^ or MgO is very effective as a general approach to suppressing orange-peel coupling in magnetic tunnel junctions. When orange-peel coupling is suppressed, the h ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620588

62. Switching Current Threshold in Planar Systems: An Analytical Approach in the Single Spin Approximation
Topic: Nanomagnetics
Published: 8/18/2006
Authors: Jacques Miltat, Mark D Stiles
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=840244

63. Enhanced Magnetoresistance Induced by Spin Transfer Torque in Granular Films with a Magnetic Field
Topic: Nanomagnetics
Published: 5/26/2006
Authors: Tingyong Chen, C Chien, Suber Huang, Mark D Stiles
Abstract: Spin-transfer torques (STT) provide a mechanism to alter the magnetic configurations of magnetic heterostructures, a result previously only achieved by an external magnetic field. In granular solids, we demonstrate a new form of STT effect that can ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620583

64. Soft magnetic layers for low-field-detection magnetic sensors
Topic: Nanomagnetics
Published: 5/18/2006
Authors: William F. Egelhoff Jr., Robert D McMichael, Cindi L Dennis, Mark D Stiles, Freemon Johnson, Alexander J. Shapiro, Brian B. Maranville, Cedric John Powell
Abstract: We have investigated a wide variety of soft magnetic layers as sense layers for magnetic-field sensors. We find that in thin-film form, some of these soft materials can have susceptibilities (?) approaching those of the corresponding bulk material. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620582

65. 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

66. 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

67. 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

68. 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

69. 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

70. 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



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