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Topic Area: Nanomagnetics

Displaying records 21 to 30 of 216 records.
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21. Magneto-optical observation of four-wave scattering in a 15 nm Ni^d81^Fe^d19^ film during large angle magnetization precession
Topic: Nanomagnetics
Published: 11/14/2011
Authors: Hans Toya Nembach, Karen Livesey, Michael Kostylev, Patrica Martin-Pimentel, Sebastian Hermsdoerfer, Britta Leven, Juergen Fassbender, Burkard Hillebrands
Abstract: Large angle magnetization precession induced by a short pulsed magnetic field in a 15 nm thick Ni^d81^Fe^d19^ film is observed using a time-resolved magneto-optical Kerr effect technique with sensitivity to all three components of the magnetization ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907497

22. 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

23. 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

24. 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

25. Damping phenomena in Co^d90^Fe^d10^/Ni multilayers and alloys
Topic: Nanomagnetics
Published: 7/6/2011
Authors: Justin M Shaw, Hans Toya Nembach, Thomas J Silva
Abstract: We used perpendicular ferromagnetic resonance to measure the damping parameter in Co^d90^Fe^d10^/Ni multilayers over a wide range of layer thicknesses. The magnetic anisotropy within this range varied from in-pane to out-of-plane. We measured (Co^d90 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908393

26. 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-likeŠ shape distortion to an ideal ellip ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907044

27. 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

28. 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

29. 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 Toya 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906064

30. Intrinsic defects in perpendicularly magnetized multilayer thin films and nanostructures
Topic: Nanomagnetics
Published: 10/26/2010
Authors: Justin M Shaw, Miles Olsen, June W. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906140



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