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4 Aug 2008

Volume 93, Issue 5, Articles (05xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 93, 051101 (2008); http://dx.doi.org/10.1063/1.2965797 (3 pages)

Mariano A. Zimmler, Jiming Bao, Federico Capasso, Sven Müller, and Carsten Ronning
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Quasiparticle cooling of a single Cooper pair transistor

A. J. Ferguson

Appl. Phys. Lett. 93, 052501 (2008); http://dx.doi.org/10.1063/1.2968214 (3 pages) | Cited 2 times

Online Publication Date: 5 August 2008

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A superconducting tunnel junction is used to directly extract quasiparticles from one of the leads of a single Cooper pair transistor. The consequent reduction in quasiparticle density causes a lower rate of quasiparticle tunneling onto the device. This rate is directly measured by radio-frequency reflectometry. Local cooling may be of direct benefit in reducing the effect of quasiparticles on coherent superconducting nanostructures.
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85.25.Cp Josephson devices
85.25.Am Superconducting device characterization, design, and modeling

Magnetic anisotropy in ferromagnetic Josephson junctions

M. Weides

Appl. Phys. Lett. 93, 052502 (2008); http://dx.doi.org/10.1063/1.2967873 (3 pages) | Cited 10 times

Online Publication Date: 5 August 2008

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Magnetotransport measurements were done on Nb/Al2O3/Cu/Ni/Nb superconductor-insulator-ferromagnet-superconductor Josephson tunnel junctions. Depending on ferromagnetic Ni interlayer thickness and geometry, the standard (1d) magnetic field dependence of critical current deviates from the textbook model for Josephson junctions. The results are qualitatively explained by a short Josephson junction model based on anisotropy and 2d remanent magnetization.
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74.25.Ha Magnetic properties including vortex structures and related phenomena
74.25.F- Transport properties
74.50.+r Tunneling phenomena; Josephson effects
74.25.Sv Critical currents
74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.)

Underlying mechanism of domain-wall motions in soft magnetic thin-film nanostripes beyond the velocity-breakdown regime

Sang-Koog Kim, Jun-Young Lee, Youn-Seok Choi, Konstantin Yu. Guslienko, and Ki-Suk Lee

Appl. Phys. Lett. 93, 052503 (2008); http://dx.doi.org/10.1063/1.2968138 (3 pages) | Cited 16 times

Online Publication Date: 6 August 2008

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It is known that oscillatory domain-wall (DW) motions in soft magnetic thin-film nanostripes above the Walker critical field lead to remarkable reductions in the average DW velocities. In a much-higher-field region beyond the velocity-breakdown regime, however, the DW velocities have been found to increase in response to a further increase of the applied field. We report on the physical underlying mechanism of this unexpected behavior. We associate the mechanism with the serial dynamic processes of the nucleation of vortex-antivortex pairs inside the stripe or at its edges, the nonlinear gyrotropic motions of vortices and antivortices, and their annihilation process. Moreover, this work evidences that a two-dimensional soliton model is required for adequate interpretation and understanding of DW motions in the linear- and oscillatory-DW-motion regimes as well as in the beyond-velocity-breakdown regime.
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75.75.-c Magnetic properties of nanostructures
75.50.Tt Fine-particle systems; nanocrystalline materials
75.60.Ch Domain walls and domain structure
75.40.Mg Numerical simulation studies
75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
75.70.Ak Magnetic properties of monolayers and thin films

Element- and site-specific oxidation state and cation distribution in manganese ferrite films by diffraction anomalous fine structure

Aria Yang, Zhaohui Chen, Anton L. Geiler, Xu Zuo, Daniel Haskel, E. Kravtsov, C. Vittoria, and V. G. Harris

Appl. Phys. Lett. 93, 052504 (2008); http://dx.doi.org/10.1063/1.2969406 (3 pages) | Cited 4 times

Online Publication Date: 8 August 2008

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Epitaxial manganese ferrite thin films were studied by x-ray diffraction anomalous fine structure to obtain element-specific and site-specific information on site occupancy, local structure, and valency. These properties were introduced to molecular field theory to reproduce thermomagnetization curves and determine superexchange energy, Néel temperature, and spin canting angle.
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68.55.-a Thin film structure and morphology
75.70.Ak Magnetic properties of monolayers and thin films
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

Coercivity mechanism of hydrogenation disproportionation desorption recombination processed Nd–Fe–B based magnets

W. F. Li, T. Ohkubo, K. Hono, T. Nishiuchi, and S. Hirosawa

Appl. Phys. Lett. 93, 052505 (2008); http://dx.doi.org/10.1063/1.2969416 (3 pages) | Cited 13 times

Online Publication Date: 8 August 2008

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We have investigated the microstructure change of hydrogenation disproportionation desorption recombination processed Nd12.5Fe73Co8B6.5 powders during the desorption recombination (DR) stage to understand the mechanism of the coercivity development in the DR process. A uniform Nd-enriched layer was found to form along the grain boundaries when coercivity starts to increase in the DR process, which should be the main reason for the coercivity development. However, the composition of this grain boundary layer was found to contain a high concentration of ferromagnetic elements.
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75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
82.30.-b Specific chemical reactions; reaction mechanisms
75.50.Tt Fine-particle systems; nanocrystalline materials
68.43.Nr Desorption kinetics
75.50.Bb Fe and its alloys
61.72.Mm Grain and twin boundaries
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