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Topic Area: Nanomagnetics

Displaying records 31 to 40 of 219 records.
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31. Effects of disorder on magnetic vortex gyration
Topic: Nanomagnetics
Published: 2/15/2011
Authors: Hongki Min, Robert D McMichael, Jacques Miltat, Mark D Stiles
Abstract: A vortex gyrating in a magnetic disc has two regimes of motion in the presence of disorder. At large amplitudes the vortex core moves quasi-freely through the disorder potential. As the amplitude decreases, the core can become pinned at a particula ...

32. Roughness induced magnetic inhomogeneity in Co/Ni multilayers: Ferromagnetic resonance and switching properties in nanostructures.
Topic: Nanomagnetics
Published: 11/10/2010
Authors: Justin M Shaw, Hans T. Nembach, Thomas J Silva
Abstract: We report on the effect roughness has on the magnetic properties of Co/Ni multilayers with perpendicular anisotropy. We can systematically vary the surface roughness and grain size by the variation in the Cu seed layer thickness. The roughness has ...

33. Intrinsic defects in perpendicularly magnetized multilayer thin films and nanostructures
Topic: Nanomagnetics
Published: 10/26/2010
Authors: Justin M Shaw, Miles Olsen, June Waiyin Lau, Michael L Schneider, Thomas J Silva, Olav Hellwig, Elizabeth Dobisz, Bruce D Terris
Abstract: Intrinsic magnetic defects in perpendicularly magnetized nanostructures reduce the predictability of device and developing recording technologies. In addition to a distribution of local anisotropy fields, we show that such defects also exhibit varia ...

34. 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 ...

35. 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 ...

36. 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 ...

37. 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 T. 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 ...

38. 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 ...

39. Microwave assisted magnetization reversal in single domain nanoelements
Topic: Nanomagnetics
Published: 7/6/2009
Authors: Hans T. 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 ...

40. 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 ...

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