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22 Sep 2003

Volume 83, Issue 12, pp. 2303-2490

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Appl. Phys. Lett. 83, 2396 (2003); http://dx.doi.org/10.1063/1.1613038 (3 pages)

A. Rida, V. Fernandez, and M. A. M. Gijs
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Magnetic photonic band-gap material at microwave frequencies based on ferromagnetic nanowires

A. Saib, D. Vanhoenacker-Janvier, I. Huynen, A. Encinas, L. Piraux, E. Ferain, and R. Legras

Appl. Phys. Lett. 83, 2378 (2003); http://dx.doi.org/10.1063/1.1610798 (3 pages) | Cited 28 times

Online Publication Date: 15 September 2003

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We present an experimental investigation of a class of microwave photonic band-gap (PBG) materials, in which the magnetic permeability μ varies periodically within the material. This material is fabricated using a periodic arrangement of arrays of magnetic nanowires. As for dielectric or metallic PBG, the band-gap behavior varies with the geometrical parameters fixing the spatial periodicity of the magnetic structure. The magnetic photonic band gap is induced by the presence of a ferromagnetic resonance effect in the vicinity of the band gap. © 2003 American Institute of Physics.
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73.22.-f Electronic structure of nanoscale materials and related systems
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.50.Tt Fine-particle systems; nanocrystalline materials
76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
42.70.Qs Photonic bandgap materials

60 ns time scale short pulse interlayer tunneling spectroscopy for Bi2Sr2CaCu2O8+δ

Kenkichi Anagawa, Yoshiharu Yamada, Takasada Shibauchi, Minoru Suzuki, and Takao Watanabe

Appl. Phys. Lett. 83, 2381 (2003); http://dx.doi.org/10.1063/1.1612891 (3 pages) | Cited 26 times

Online Publication Date: 15 September 2003

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We utilize the short pulse interlayer tunneling spectroscopy on a 60 ns time scale for the Bi2Sr2CaCu2O8+δ system. The results indicate that the influence of self-heating is negligible up to an injection current density of ∼ 60 kA/cm2 and an injection power areal density of ∼ 90 kW/cm2. By means of this technique, we are able to observe the superconducting gap, the pseudogap, and the dip-and-hump structure precisely with little influence from the self-heating. © 2003 American Institute of Physics.
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74.72.-h Cuprate superconductors
74.50.+r Tunneling phenomena; Josephson effects
74.25.Jb Electronic structure (photoemission, etc.)

Enhanced intergrain magnetoresistance in bulk Sr2FeMoO6 through controlled processing

A. Sharma, A. Berenov, J. Rager, W. Branford, Y. Bugoslavsky, L. F. Cohen, and J. L. MacManus-Driscoll

Appl. Phys. Lett. 83, 2384 (2003); http://dx.doi.org/10.1063/1.1613358 (3 pages) | Cited 21 times

Online Publication Date: 15 September 2003

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Enhanced low field magnetoresistance (LFMR) values have been obtained in bulk Sr2FeMoO6 through controlled processing. MR values, R(H)/R(0) of ∼ 60% [(R(H)−R(H = 0)/R(H = 0) = 40%] were achieved at 50 K, in 1 T, and R(H)/R(0) ∼ 8% [(R(H)−R(H = 0)/R(H = 0) = 92%] at 290 K, in 1 T. For a ∼ 1 μm starting particle size, the optimum sintering temperature was 1300 °C, 100 °C higher than normally used. The optimum sintering time in Ar/H2 was only 5 h, much shorter than normally used. The magnitude of the LFMR appears to depend strongly on grain boundary oxygen content, controlled through optimization of sintering temperature and time. © 2003 American Institute of Physics.
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75.47.De Giant magnetoresistance
81.05.Je Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides)
81.20.Ev Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation
72.20.My Galvanomagnetic and other magnetotransport effects
61.72.Mm Grain and twin boundaries
81.40.Rs Electrical and magnetic properties related to treatment conditions

Design of realistic switches for coupling superconducting solid-state qubits

Markus J. Storcz and Frank K. Wilhelm

Appl. Phys. Lett. 83, 2387 (2003); http://dx.doi.org/10.1063/1.1612901 (3 pages) | Cited 7 times

Online Publication Date: 15 September 2003

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Superconducting flux qubits are a promising candidate for solid-state quantum computation. One of the reasons is that implementing a controlled coupling between the qubits appears to be relatively easy, if one uses tunable Josephson junctions. We evaluate possible coupling strengths and show how much extra decoherence is induced by the subgap conductance of a tunable junction. In light of these results, we evaluate several options of using intrinsically shunted junctions and show that based on available technology, Josephson field effect transistors and high-Tc junctions used as π shifters would be a good option, whereas the use of magnetic junctions as π shifters severely limits quantum coherence. © 2003 American Institute of Physics.
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85.25.Cp Josephson devices
85.25.Qc Superconducting surface acoustic wave devices and other superconducting devices
74.81.Fa Josephson junction arrays and wire networks

High-Tc interferometers using all YBa2Cu3O7−δ trilayer junctions

H. Sato, E. Fujimoto, T. Yamada, H. Akoh, T. Nakajima, K. Hohkawa, H. Nakagawa, and M. Aoyagi

Appl. Phys. Lett. 83, 2390 (2003); http://dx.doi.org/10.1063/1.1613037 (3 pages)

Online Publication Date: 15 September 2003

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We have demonstrated high-Tc interferometers using YBaCuO trilayer junctions, which are two-junction-type interferometers with a direct current injection. In order to realize a small loop inductance value without a ground plane, the interferometers were designed to have loop inductance with a vertical stacked structure by overlapping junction bridges on base electrodes. The interferometers showed clear threshold characteristics in the control current dependence of the gate current at temperatures below 70 K. The temperature dependence of the loop inductance showed good agreement with a calculation result based on a strip-line model. The sheet inductance was estimated to be 0.85 pH/□ at 4.2 K from the threshold characteristics of the interferometers by changing the bridge length between the two junctions, which was in good agreement with the design value. © 2003 American Institute of Physics.
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85.25.-j Superconducting devices
74.72.-h Cuprate superconductors
74.78.-w Superconducting films and low-dimensional structures
74.45.+c Proximity effects; Andreev reflection; SN and SNS junctions

Molecular-beam-epitaxy growth of ferromagnetic Ni2MnGe on GaAs(001)

J. Lu, J. W. Dong, J. Q. Xie, S. McKernan, C. J. Palmstrøm, and Y. Xin

Appl. Phys. Lett. 83, 2393 (2003); http://dx.doi.org/10.1063/1.1612900 (3 pages) | Cited 10 times

Online Publication Date: 15 September 2003

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Single-crystal Heusler alloy Ni2MnGe thin films have been grown on GaAs(001) by molecular-beam epitaxy. X-ray diffraction and transmission electron microscopy were used for postgrowth structural characterization. The Ni2MnGe grew in a tetragonally distorted L21-like structure (a = 5.65 Å, c = 5.96 Å) with the c axis perpendicular to the film surface. An in-plane ordering with 2× periodicity and an out-of-plane ordering with 3× periodicity was observed for the as-grown films. Magnetometry measurements performed at 50 K indicate that the films are ferromagnetic and have a weak in-plane anisotropy with a coercivity ∼5.5 Oe and saturation magnetization of ∼450 emu/cm3. The Curie temperature was measured to be ∼320 K. © 2003 American Institute of Physics.
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75.50.Cc Other ferromagnetic metals and alloys
75.70.Ak Magnetic properties of monolayers and thin films
75.30.Gw Magnetic anisotropy
81.15.Hi Molecular, atomic, ion, and chemical beam epitaxy
68.37.Lp Transmission electron microscopy (TEM)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Long-range transport of magnetic microbeads using simple planar coils placed in a uniform magnetostatic field

A. Rida, V. Fernandez, and M. A. M. Gijs

Appl. Phys. Lett. 83, 2396 (2003); http://dx.doi.org/10.1063/1.1613038 (3 pages) | Cited 44 times

Online Publication Date: 15 September 2003

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We propose an approach for magnetic microbead transport in microfluidic channels over long-range distances using an array of simple planar coils. The latter are placed in a uniform static magnetic field, the role of which is to impose a permanent magnetic moment to the microbeads. The very small magnetic field gradient of a simple planar coil is then sufficient to displace the microbeads. The long-range displacement is assured by arranging adjacent coils in the array with spatial overlap in a three-phase actuation scheme. © 2003 American Institute of Physics.
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85.70.-w Magnetic devices
84.32.Hh Inductors and coils; wiring
47.85.Np Fluidics
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
41.20.Gz Magnetostatics; magnetic shielding, magnetic induction, boundary-value problems
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