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Topic Area: Nanomagnetics

Displaying records 11 to 20 of 201 records.
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11. Control of magnetic fluctuations by spin current
Topic: Nanomagnetics
Published: 9/2/2011
Authors: Vladislav E Demidov, Sergei Urazhdin, Eric Edwards, Mark D Stiles, Robert D McMichael, Sergej O Demokritov
Abstract: We utilize micro-focus Brillouin light scattering spectroscopy to study the interaction of spin current generated by the spin Hall effect with magnetic fluctuations in a Permalloy microdisc. We show that the fluctuations can be efficiently enhanced o ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908492

12. Perpendicular ferromagnetic resonance measurements of damping and Landé g-factor in sputtered (Co^d2^Mn)^d1-x^Ge^dx^ thin films
Topic: Nanomagnetics
Published: 8/8/2011
Authors: Thomas J Silva, Hans Toya Nembach, Justin M Shaw, Michael Schneider, Matt Carey, Stefan Maat, Jeff Childress
Abstract: X-ray diffraction (XRD), magnetometry, and ferromagnetic resonance (FMR) measurements were performed on sputtered thin films of the nominal Heusler alloy (Co^d2^Mn)^d1-x^Ge^dx^ with varying Ge content and annealing temperature. XRD indicates some deg ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906314

13. Impact of Gd dopants on current polarization and the resulting effect on spin-transfer velocity in Permalloy wires
Topic: Nanomagnetics
Published: 8/1/2011
Authors: Rebecca L Thomas, Meng Zhu, Cindi L Dennis, Veena Misra, Robert D McMichael
Abstract: A spin-wave Doppler technique is used to measure the spin-transfer velocity and the current polarization in current-carrying (Ni80Fe20)1-xGdx alloy wires. Reduced magnetization values with Gd doping suggest possible increases in the spin-transfer ve ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908389

14. Effects of shape distortions and imperfections on mode frequencies and collective linewidths in nanomagnets
Topic: Nanomagnetics
Published: 3/28/2011
Authors: Hans Toya Nembach, Justin M Shaw, Thomas J Silva, Ward L Johnson, Sudook A Kim, Robert D McMichael, Pavel Kabos
Abstract: We used Brillouin light scattering to show that shape distortions in Ni80Fe20 nanoelements can have a dramatic effect on the measured linewidth of certain modes. By intentionally introducing an amount of “egg-like” shape distortion to an ideal ellip ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907044

15. Effect of interactions on edge property measurements in magnetic multilayers
Topic: Nanomagnetics
Published: 2/25/2011
Authors: Meng Zhu, Robert D McMichael
Abstract: This paper reports effects of inter-film interactions on static and dynamic magnetization behavior at film edges in magnetic trilayer stripe arrays under transverse applied fields. The trilayers consist of two magnetic films of Ni80Fe20, 10 nm and 2 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906468

16. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906934

17. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904112

18. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903652

19. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904208

20. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903594