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Micron scale ferromagnetic tubes placed on the ends of ferromagnetic CoTaZr spin waveguides are explored in order to enhance the excitation of Backward Volume Magnetostatic Spin Waves. The tubes produce a closed magnetic circuit about the signal line
Externí odkaz:
http://arxiv.org/abs/1009.4986
Autor:
Lee, D. W., V., L. De Los Santos, Seo, J. W., Felix, L. Leon, D., A. Bustamante, Cole, J. M., Barnes, C. ~H. ~W.
The structure of graphite oxide (GO) has been systematically studied using various tools such as SEM, TEM, XRD, Fourier transform infrared spectroscopy (FT-IR), X-ray photoemission spectroscopy (XPS), 13C solid state NMR, and O K-edge X-ray absorptio
Externí odkaz:
http://arxiv.org/abs/1008.0937
Autor:
Lee, D. W., Seo, J. W.
We develop a new chemical route to prepare carbon nanotubes at room temperature. Graphite powder is immersed in a mixed solution of nitric and sulfuric acid with potassium chlorate. After heating the solution up to 70{\deg}C and leaving them in the a
Externí odkaz:
http://arxiv.org/abs/1007.1062
Autor:
Lee, D. W., Seo, J. W.
Publikováno v:
J. Phys. Chem. C, 115, 2705 (2011)
Graphite oxide is an amorphous insulator. Although several models have been suggested, its structure remains controversial. To elucidate this issue, 5 samples were prepared by the Brodie process and the Staudenmaier process. The electronic structure
Externí odkaz:
http://arxiv.org/abs/1007.0287
Autor:
Lee, D. W., Cole, J. M., Seo, J. W., Saxena, S. S., Barnes, C. H. W., Chia, E. E. M., Panagopoulos, C.
We investigate the magnetism in graphite by controlled oxidation. Our approach renders graphite an insulator while maintaining its structure. Fourier transform infrared spectroscopy and X-ray absorption near edge structure spectra reveal that graphit
Externí odkaz:
http://arxiv.org/abs/1005.5580
Autor:
Lee, D. W., Seo, J. W., Jelbert, G. R., V., L. de Los Santos, Cole, J. M., Panagopoulos, C., Barnes, C. H. W.
Publikováno v:
APPLIED PHYSICS LETTERS 95, 172901 ?2009?
Here we report on the preparation of transparent and flexible polymerized graphite oxide, which is composed of carbons with sp3-hybridized orbitals and a non-planar ring structure, and which demonstrates dispersion in its dielectric constant at room
Externí odkaz:
http://arxiv.org/abs/1005.5576
Resonant coupling of coplanar waveguides is explored by wrapping proximate shorted ends of the waveguides with micron size ferromagnetic Co90Ta5Zr5 tubes. Ferromagnetic resonance and up to 7 outer surface modes are identified. Experimental results fo
Externí odkaz:
http://arxiv.org/abs/0910.2442
Autor:
Kozhanov, A., Ouellette, D., Rodwell, M., Jacob, A. P., Lee, D. W., Wang, S. X., Allen, S. J.
Magnetostatic spin wave dispersion and loss are measured in micron scale spin wave-guides in ferromagnetic, metallic CoTaZr. Results are in good agreement with model calculations of spin wave dispersion. The measured attenuation lengths, of the order
Externí odkaz:
http://arxiv.org/abs/0811.0353
Autor:
Kozhanov, A., Ouellette, D., Griffith, Z., Rodwell, M., Jacob, A. P., Lee, D. W., Wang, S. X., Allen, S. J.
Magnetostatic spin wave dispersion and loss are measured in micron scale spin wave-guides in ferromagnetic, metallic CoTaZr. Results are in good agreement with model calculations of spin wave dispersion and up to three different modes are identified.
Externí odkaz:
http://arxiv.org/abs/0811.0350