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You searched on: Topic Area: Nanomagnetics

Displaying records 11 to 20 of 21 records.
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11. Spectroscopy and imaging of edge modes in Permalloy nanodisks
Topic: Nanomagnetics
Published: 1/3/2013
Authors: Feng Guo, Lyubov Belova, Robert D McMichael
Abstract: This paper reports spectroscopy and imaging of spin wave modes using ferromagnetic resonance force microscopy (FMRFM) in Permalloy nano-disks with disk diameters that range from 100 nm to 750 nm. The ferromagnetic resonance spectra distinguish multip ...

12. Two dimensional spectroscopic imaging of individual ferromagnetic nanostripes
Topic: Nanomagnetics
Published: 11/6/2012
Authors: Han-Jong H. Chia, Feng Guo, Lyubov Belova, Robert D McMichael
Abstract: We use ferromagnetic resonance force microscopy (FMRFM) to spectroscopically image the edge modes in individual 700 and 400 nm wide Permalloy stripes with a spatial resolution on the order of 200 nm. The imaging clearly identi es some resonances as ...

13. Micromagnetic investigation of periodic cross-tie/vortex wall geometry
Topic: Nanomagnetics
Published: 5/18/2012
Author: Michael J Donahue
Abstract: A systematic series of micromagnetic simulations on periodic cross-tie/vortex wall structures in an ideal soft film at various width, thickness, and period lengths is performed. For each width and thickness a natural period length is found which has ...

14. Nanoscale spin wave localization using ferromagnetic resonance force microscopy
Topic: Nanomagnetics
Published: 2/24/2012
Authors: Han-Jong H. Chia, Feng Guo, Lyubov Belova, Robert D McMichael
Abstract: We utilize ferromagnetic resonance force microscopy (FMRFM) to generate and detect multiple localized spin wave modes with spatial dimensions less than 100 nm in ferromagnetic thin films. Localized spin waves are a potentially powerful tool for ima ...

15. 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 ...

16. 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 ...

17. 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 ...

18. 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 ...

19. 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 ...

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 ...

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