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3 Jul 2006

Volume 89, Issue 1, Articles (01xxxx)

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Appl. Phys. Lett. 89, 011901 (2006); http://dx.doi.org/10.1063/1.2218670 (3 pages)

L. S. Wang, S. Tripathy, B. Z. Wang, J. H. Teng, S. Y. Chow, and S. J. Chua
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Hydrogen kinetics in magnesium hydride: On different catalytic effects of niobium

N. Bazzanella, R. Checchetto, A. Miotello, C. Sada, P. Mazzoldi, and P. Mengucci

Appl. Phys. Lett. 89, 014101 (2006); http://dx.doi.org/10.1063/1.2218328 (3 pages) | Cited 16 times

Online Publication Date: 5 July 2006

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The hydrogen desorption kinetics from pure and Nb-doped MgH2 samples was studied as function of the Nb concentration (6×10−4<[Nb/Mg]<5×10−2). Structural and kinetics analyses indicate that Nb acts as catalyst both when Nb atoms aggregate forming NbH clusters dispersed in the MgH2 and also when Nb is contained as atomic impurity. It is suggested that the local atomic environment around the Nb atom acts as seed for h-Mg phase nucleation which constitutes the rate limiting step for the hydrogen kinetics while, when the Nb concentration exceeds about 1 at. %, the rate limiting step is hydrogen diffusion.
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82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces
68.43.Mn Adsorption kinetics
61.72.S- Impurities in crystals
64.60.Q- Nucleation
66.30.J- Diffusion of impurities

Mobile atom traps using magnetic nanowires

D. A. Allwood, T. Schrefl, G. Hrkac, I. G. Hughes, and C. S. Adams

Appl. Phys. Lett. 89, 014102 (2006); http://dx.doi.org/10.1063/1.2219397 (3 pages) | Cited 15 times

Online Publication Date: 6 July 2006

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By solving the Landau-Lifshitz-Gilbert equation using a finite element method we show that an atom trap can be produced above a ferromagnetic nanowire domain wall. Atoms experience trap frequencies of up to a few megahertz, and can be transported by applying a weak magnetic field along the wire. Lithographically defined nanowire patterns could allow quantum information processing by bringing domain walls in close proximity at certain places to allow trapped atom interactions and far apart at others to allow individual addressing.
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75.50.Bb Fe and its alloys
75.50.Tt Fine-particle systems; nanocrystalline materials
75.60.Ch Domain walls and domain structure
75.70.Kw Domain structure (including magnetic bubbles and vortices)
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