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Topic Area: Nanomagnetics

Displaying records 21 to 30 of 201 records.
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21. Spin Transfer Torques by Point-Contact Spin injection
Topic: Nanomagnetics
Published: 8/24/2009
Authors: Tingyong Chen, Yi Ji, S X Huang, C L Chien, Mark D Stiles
Abstract: Spin-transfer torques (STT) provide a new mechanism to alter the magnetic configuration in magnetic heterostructures, a feat previously only achieved by an external magnetic field. A current flowing perpendicular through a noncollinear magnetic spin ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903458

22. Microwave assisted magnetization reversal in single domain nanoelements
Topic: Nanomagnetics
Published: 7/6/2009
Authors: Hans Toya Nembach, Hans Bauer, Justin M Shaw, Michael Schneider, Thomas J Silva
Abstract: We studied the microwave assisted magnetic reversal in 65×71 nm^u2^ elliptical Ni^d80^Fe^d20^ nanomagnets with a thickness of 10 nm. Hysteresis curves were measured by magneto-optical Kerr effect for a range of microwave frequencies and amplitudes. W ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902206

23. Direct Imaging of Current Driven Domain Walls in Ferromagnetic Nanostripes
Topic: Nanomagnetics
Published: 5/21/2009
Authors: Willard C Uhlig, Michael J Donahue, Daniel Thornton Pierce, John Unguris
Abstract: To better understand the response of domain walls to current induced spin transfer torques, we have directly imaged the internal magnetic structure of domain walls in current-carrying ferromagnetic nanostripes. Domain wall images were acquired both ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900191

24. Evaluating the locality of intrinsic precession damping in transition metals
Topic: Nanomagnetics
Published: 4/24/2009
Authors: Keith Gilmore, Mark D Stiles
Abstract: The Landau-Lifshitz-Gilbert damping parameter is typically assumed to be a local quantity, independent of the magnetic configuration. To test the validity of this assumption we calculate the precession damping rate of small amplitude non-uniform mod ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901357

25. Non-Adiabatic Spin Transfer Torque in Real Materials
Topic: Nanomagnetics
Published: 3/16/2009
Authors: Ion Garate, Keith Gilmore, Mark D Stiles, Allan H. MacDonald
Abstract: The motion of simple domain walls and of more complex magnetic textures in the presence of a transport current is described by the Landau-Lifshitz-Slonczewski (LLS) equations. Predictions of the LLS equations depend sensitively on the ratio betwee ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901198

26. A new connection between electricity and magnetism
Topic: Nanomagnetics
Published: 2/9/2009
Authors: Robert D McMichael, Mark D Stiles
Abstract: A Viewpoint on ``Universal Electromotive Force Induced by Domain Wall Motion,'' Shengyuan A. Yang, Geoffrey S. D. Beach, Carl Knutson, Di Xiao, Qian Niu, Maxim Tsoi and James L. Erskine.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901498

27. Bias dependence of magnetic exchange interactions: application to interlayer exchange coupling in spin valves.
Topic: Nanomagnetics
Published: 2/3/2009
Authors: Paul M Haney, Christian Heiliger, Mark D Stiles
Abstract: We study how a bias voltage changes magnetic exchange interactions. We derive a general expression for magnetic exchange interactions for open systems under a bias potential, and apply it to spin valves. We find that for metallic systems, the inte ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620602

28. Reply to Comment on Adiabatic Domain Wall Motion and Landau-Lifshitz Damping
Topic: Nanomagnetics
Published: 12/3/2008
Authors: Mark D Stiles, W Saslow, Michael J Donahue, Andrew Zangwill
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620608

29. A New Spin on the Doppler Effect
Topic: Nanomagnetics
Published: 10/17/2008
Authors: Mark D Stiles, Robert D McMichael
Abstract: The coupling between ferromagnetism and electrical current has recently been the object of intense study because of the combination of interesting scientific developments and the potential technological impact. This coupling is mediated by spin curr ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620606

30. Ab Initio Studies of the Spin-Transfer Torque in Tunnel Junctions
Topic: Nanomagnetics
Published: 5/9/2008
Authors: Christian Heiliger, Mark D Stiles
Abstract: We calculate the spin-transfer torque in Fe/MgO/Fe tunnel junctions and analyze the results in comparison to all-metallic junctions. We show that the spin-transfer torque is interfacial in the ferromagnetic layer to a greater degree than in spin-valv ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620023