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Topic Area: Nanomagnetics

Displaying records 61 to 70 of 218 records.
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61. Spin Transfer Torque and Dynamics
Topic: Nanomagnetics
Published: 11/1/2006
Authors: Mark D Stiles, J Miltat
Abstract: The currents in magnetic multilayers are spin polarized and carry enough angular momentum that they can cause magnetic reversal and induce stable precession of the magnetization in thin magnetic layers. The flow of spins is determined by the spin{ma ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620576

62. Anisotropy of Magnetization Reversal and Magnetoresistance in Square Arrays of Permalloy Nano-Rings
Topic: Nanomagnetics
Published: 10/1/2006
Authors: A Goncharov, A Zhukov, V Metlushko, G Bordignon, H Fangohr, C de Groot, John Unguris, Willard C Uhlig, G Karapetrov, B Ilic, P A. de Groot
Abstract: Magnetization reversal mechanisms and the impact of magnetization direction are studied in square arrays of interconnected circular permalloy nanorings using magnetooptical Kerr effect, local imaging, numerical simulations, and transport techniques. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620589

63. 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

64. 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

65. 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

66. 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

67. 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

68. 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

69. 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

70. 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



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