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Topic Area: Nanomagnetics

Displaying records 31 to 40 of 216 records.
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31. Influence of band parameters on spin-transfer torque in tunnel junctions: model calculations
Topic: Nanomagnetics
Published: 6/1/2010
Authors: Asma H. Khalil, Mark D Stiles, Christian Heiliger
Abstract: We study the in--plane spin--transfer torque in magnetic tunnel junctions for different band fillings and exchange splittings. The range of biases over which the in--plane torque is linear depends strongly on these parameters. If the ferromagnetic l ...

32. Anisotropic damping of the magnetization dynamics in Fe, Ni and Co
Topic: Nanomagnetics
Published: 5/17/2010
Authors: Daniel Steiauf, Jonas Seib, Manfred Faehnle, Keith Gilmore, Mark D Stiles
Abstract: The Gilbert parameter alpha describing the damping of magnetization dynamics is commonly taken to be an isotropic scalar. We argue that it is a tensor, that is anisotropic, leading to a dependence of the damping on both the instantaneous direction ...

33. Measuring the effects of low energy ion milling on the magnetization of Co/Pd multilayers using scanning electron microscopy with polarization analysis
Topic: Nanomagnetics
Published: 4/30/2010
Authors: Benjamin James McMorran, Aaron C. Cochran, Randy K. Dumas, Kai Liu, Paul Morrow, Daniel Thornton Pierce, John Unguris
Abstract: The dependence of the magnetic properties of Co/Pd multilayer films with very thin individual layers, Co(0.4nm)/Pd(0.6nm), on the energy of ion milling is investigated using scanning electron microscopy with polarization analysis (SEMPA). The effect ...

34. Effect of microstructure on magnetic properties and anisotropy distributions in Co/Pd thin films and nanostructures
Topic: Nanomagnetics
Published: 11/19/2009
Authors: Justin M Shaw, Hans Toya Nembach, Thomas J Silva, Stephen E Russek, Roy Howard Geiss
Abstract: The structure of Co/Pd multilayers has a strong effect on the localized anisotropy distribution within a film and the resulting switching properties of nanostructures fabricated from identical material. By varying the underlying seed layer, the micr ...

35. 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 ...

36. 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 ...

37. 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 ...

38. 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 ...

39. 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 ...

40. 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.

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