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You searched on: Topic Area: Nanomagnetics

Displaying records 1 to 10 of 17 records.
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1. 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 ...

2. Magnetic structure and anisotropy of [Co/Pd]_5/NiFe multilayers
Topic: Nanomagnetics
Published: 1/9/2015
Authors: Larysa Tryputen, Feng Guo, Liu Frank, T. N. Anh Nguyen, Majid Mohseni, Sunjae Chung, Yeyu Fang, Johan Akerman, Robert D McMichael, Caroline Ross
Abstract: The magnetization behavior, magnetic anisotropy and domain congurations of Co/Pd multilayers with perpendicular magnetic anisotropy capped with permalloy is investigated using magnetometry, magnetic force microscopy and ferromagnetic resonance. The ...

3. 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 ...

4. Head and Media Challenges for 3 Tb/in^u2^ Microwave Assisted Magnetic Recording
Topic: Nanomagnetics
Published: 2/3/2014
Authors: Thomas J Silva, Justin M Shaw, Hans Toya Nembach, Mike Mallary, Kumar Srinivasan, Gerado Bertero, Dan Wolf, Christian Kaiser, Michael Chaplin, Mahendra Pakala, Leng Qunwen, Yiming Wang, Carl Elliot, Lui Francis
Abstract: A specific design for Microwave Assisted Magnetic Recording (MAMR) at about 3Tb/in^u2^ (0.47 Tb/cm^u2^ or 4.7 Pb/m^u2^) is discussed in detail to highlight the challenges of MAMR and to contrast its requirements with conventional Perpendicular Magnet ...

5. Field-driven sense elements for chirality-dependent domain wall detection and storage
Topic: Nanomagnetics
Published: 12/10/2013
Authors: Samuel R. Bowden, John Unguris
Abstract: A method for locally sensing and storing data of transverse domain wall chirality in planar nanowire logic and memory systems is presented. Patterned elements, in close proximity to the nanowires, respond to the asymmetry in the stray field from the ...

6. 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 ...

7. 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 ...

8. 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 ...

9. 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 ...

10. 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 ...

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