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Topic Area: Nanomagnetics

Displaying records 41 to 50 of 201 records.
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41. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620019

42. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620017

43. Two Simple Tests for Models of Current-Induced Magnetization Switching
Topic: Nanomagnetics
Published: 1/1/2007
Authors: N Theodoropoulou, A Sharma, W Pratt, Mark D Stiles, J Xiao, J Bass
Abstract: We describe two simple tests for models of current-induced magnetization switching due to spin-transfer-torque in ferromagnetic/non-magnetic/ferromagnetic (F/N/F) trilayers. The first involves comparing calculated and measured values of the ratio X = ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620016

44. Magnetic Properties of Co/GaAs(110)
Topic: Nanomagnetics
Published: 12/4/2006
Authors: T Monchesky, John Unguris
Abstract: We observed three magnetic states of an ultrathin, atomically well-ordered Co film grown on a cleaved GaAs(110) substrate. For a Co thickness less than 3.4 monolayers (ML), we find a ferromagnetically dead layer associated with the formation of int ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620592

45. 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

46. 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

47. 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

48. 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

49. 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

50. 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