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You searched on: Topic Area: Nanomagnetics

Displaying records 21 to 30 of 220 records.
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21. Determination of spin pumping as a source of linewidth sputtered Co^d90^Fe^d10^/Pd multilayers by use of broadband ferromagnetic resonance spectroscopy
Topic: Nanomagnetics
Published: 2/10/2012
Authors: Justin M Shaw, Hans Toya Nembach, Thomas J Silva
Abstract: We performed a systematic study of damping in Co^d90^Fe^d10^/Pd multilayers by use of broadband (1‹ 60 GHz) ferromagnetic resonance (FMR) spectroscopy in the perpendicular geometry. The data were fitted with the conventional Landau-Lifshitz equation ...

22. Formation and structure of 360 and 540 degree domain walls in thin magnetic stripes
Topic: Nanomagnetics
Published: 2/10/2012
Authors: Youngman Jang, Samuel R. Bowden, Mark Mascaro, John Unguris, Caroline Ross
Abstract: 360˚, 540˚ and other complex transverse domain walls have been created in narrow Co wires connected to injection pads by cycling a magnetic field perpendicular to the wire length. The composite walls, formed by impingement of 180˚ tran ...

23. First-Principles Calculation of the Non-Adiabatic Spin Transfer Torque in Ni and Fe
Topic: Nanomagnetics
Published: 12/16/2011
Authors: Keith Gilmore, Ion Garate, Allan H. MacDonald, Mark D Stiles
Abstract: The magnetization dynamics of a ferromagnet subjected to an electrical current are given by an extension of the Landau-Lifshitz-Gilbert equation that contains two additional terms, the adiabatic and non-adiabatic spin-transfer torques. First-prin ...

24. TaOx Memristive Devices with Ferromagnetic Electrodes
Topic: Nanomagnetics
Published: 12/7/2011
Authors: Hyuk-Jae Jang, Pragya Rasmi Shrestha, Oleg A Kirillov, Helmut Baumgart, Kin P Cheung, Oana Jurchescu, Curt A Richter

25. 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 ...

26. 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 ...

27. 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 ...

28. 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 ...

29. 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 ...

30. 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 ...

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