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You searched on: Topic Area: Nanomagnetics Sorted by: title

Displaying records 11 to 20 of 21 records.
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11. Measurement of orbital asymmetry and strain in Co^d90^Fe^d10^/Ni multilayers and alloys: Origins of perpendicular anisotropy
Topic: Nanomagnetics
Published: 2/13/2013
Authors: Justin M Shaw, Hans Toya Nembach, Thomas J Silva
Abstract: We use broadband ferromagnetic resonance spectroscopy and x-ray diffraction to investigate the fundamental origin of perpendicular anisotropy in Co^d90^Fe^d10^/Ni multilayers. By careful evaluation of the spectroscopic {I}g{/I}-factor, we determine ...

12. 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 ...

13. 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 ...

14. Nonlinear ferromagnetic resonance shift in submicron Permalloy ellipses
Topic: Nanomagnetics
Published: 2/27/2015
Authors: Feng Guo, Lyubov Belova, Robert D McMichael
Abstract: We report a systematic study of nonlinearity in the ferromagnetic resonance of a series of submicron Permalloy ellipses with varying aspect ratios. We focus on the sign of the foldover, a resonance field shift or frequency shift that occurs with hig ...

15. Parametric pumping of precession modes in ferromagnetic nanodisks
Topic: Nanomagnetics
Published: 3/26/2014
Authors: Feng Guo, Lyubov Belova, Robert D McMichael
Abstract: We report parametric excitation of magnetic precession modes in nanodisks using a parallel pumping configuration. The excitations are detected using a ferromagneitc resonance force microscopy method, and the parallel-pumped spectra reveal nonlinear c ...

16. Quantitative magnetometry of ferromagnetic nanorods by microfluidic analytical magnetophoresis
Topic: Nanomagnetics
Published: 9/3/2015
Authors: Andrew Lee Balk, Lamar O. Mair, Feng Guo, Carlos M. Hangarter, Pramod Pappachan Mathai, Robert D McMichael, Samuel M Stavis, John Unguris
Abstract: We introduce an implementation of magnetophoresis to measure the absolute magnetization of ferromagnetic nanorods dispersed in fluids, by analyzing the velocity of single nanorods under an applied magnetic field gradient. A microfluidic guideway prev ...

17. 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 ...

18. Scanning localized magnetic fields in microfluidic device using single spin in nanodiamond
Topic: Nanomagnetics
Published: 2/5/2015
Authors: Jacob M Taylor, K. Lim, Chad Ropp, Benjamin Shapiro, Edo Waks
Abstract: We demonstrate localized magnetometry using a single nitrogen vacancy (NV) center in a microfluidic device. Our approach can manipulate magnetic objects in three dimensions within a liquid environment and also orients their magnetic dipole. A diamond ...

19. 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 ...

20. Spin-scattering rates in metallic thin films measured by ferromagnetic resonance damping enhanced by spin-pumping
Topic: Nanomagnetics
Published: 6/12/2015
Authors: Carl T. Boone, Justin M Shaw, Hans Toya Nembach, Thomas J Silva
Abstract: We determined the spin-transport properties of Pd and Pt thin films by measuring the increase in ferromagnetic resonance damping due to spin-pumping in ferromagnetic (FM)-nonferromagnetic metal (NM) multilayers with varying NM thicknesses. The increa ...

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