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9 Jul 2001

Volume 79, Issue 2, pp. 145-277

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Magnetically soft, high-moment, high-resistivity thin films using discontinuous metal/native oxide multilayers

G. S. D. Beach, A. E. Berkowitz, F. T. Parker, and David J. Smith

Appl. Phys. Lett. 79, 224 (2001); http://dx.doi.org/10.1063/1.1383998 (3 pages) | Cited 17 times

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Multilayers consisting of discontinuous metal layers with native oxide surfaces have been fabricated using CoxFe100−x alloys ranging in composition from pure Co to pure Fe. For the Fe-containing compositions, the composites are magnetically soft with resistivities in the range of 100 to 2000 μΩ cm. Mössbauer spectroscopy indicates a magnetically ordered Fe-oxide component, and the magnetic moment of the oxide phase for pure Fe/native oxide multilayers has been determined. © 2001 American Institute of Physics.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
73.63.-b Electronic transport in nanoscale materials and structures
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Cr Saturation moments and magnetic susceptibilities
68.65.Ac Multilayers
75.50.Bb Fe and its alloys
76.80.+y Mössbauer effect; other γ-ray spectroscopy

Superconducting MgB2 thin films by pulsed laser deposition

S. R. Shinde, S. B. Ogale, R. L. Greene, T. Venkatesan, P. C. Canfield, S. L. Bud’ko, G. Lapertot, and C. Petrovic

Appl. Phys. Lett. 79, 227 (2001); http://dx.doi.org/10.1063/1.1385186 (3 pages) | Cited 46 times

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Growth of MgB2 thin films by pulsed laser deposition is examined under ex situ and in situ processing conditions. For the ex situ process, boron films grown by pulsed laser deposition were annealed at 900 °C with excess Mg. For the in situ process, different approaches involving ablation from a stoichiometric target under different growth conditions, as well as multilayer deposition involving interposed Mg layers were examined and analyzed. Magnetic measurements on ex situ processed films show Tc of ∼39 K, while the current best in situ films show a susceptibility transition at ∼22 K. © 2001 American Institute of Physics.
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81.15.Fg Pulsed laser ablation deposition
74.78.-w Superconducting films and low-dimensional structures
74.10.+v Occurrence, potential candidates
74.62.Bf Effects of material synthesis, crystal structure, and chemical composition
74.25.Ha Magnetic properties including vortex structures and related phenomena

Large transport critical currents in unsintered MgB2 superconducting tapes

Giovanni Grasso, Andrea Malagoli, Carlo Ferdeghini, Scilla Roncallo, Valeria Braccini, Antonio S. Siri, and Maria R. Cimberle

Appl. Phys. Lett. 79, 230 (2001); http://dx.doi.org/10.1063/1.1384905 (3 pages) | Cited 181 times

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The powder-in-tube process has been employed to fabricate tape-like conductors with a strong metallic sheath and based on the newly discovered MgB2 superconducting phase. Long superconducting tapes have been prepared by packing reacted MgB2 powders inside pure Ag, Cu, and Ni tubes which are then cold worked by drawing and rolling. Such tapes have shown transport properties as good as bulk MgB2 samples sintered in high pressure and high temperature conditions. At 4.2 K, the highest critical current density of 105 A/cm2 has been achieved on nickel-sheathed single-filament conductors. A direct correlation between the sheath tensile strength and the critical current of the unsintered tape has been observed. © 2001 American Institute of Physics.
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84.71.Mn Superconducting wires, fibers, and tapes
74.25.Sv Critical currents
81.20.Ev Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation
74.72.-h Cuprate superconductors
81.40.Ef Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization
81.05.Mh Cermets, ceramic and refractory composites

Magnetotransport in manganite trilayer junctions grown by 90° off-axis sputtering

J. S. Noh, T. K. Nath, C. B. Eom, J. Z. Sun, W. Tian, and X. Q. Pan

Appl. Phys. Lett. 79, 233 (2001); http://dx.doi.org/10.1063/1.1383276 (3 pages) | Cited 19 times

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We report magnetotransport studies on La0.67Sr0.33MnO3/SrTiO3/La0.67Sr0.33MnO3 trilayer junctions, fabricated using 90° off-axis sputtering. Films were grown on both (001) (LaAlO3)0.3–(Sr2AlTaO6)0.7 and (110) NdGaO3 substrates. The sputtered trilayers show improved junction resistance uniformity over those made using pulsed laser deposition. Cross-sectional transmission electron microscopy and atomic force microscopy studies confirm smooth interfaces and a uniform barrier. Magnetoresistances up to ∼100% are observed for junctions on (001) (LaAlO3)0.3–(Sr2AlTaO6)0.7 with a 30 Å barrier at 13 K and around 100 Oe. Junction magnetoresistance versus magnetic field behavior is more stable, indicating improved transport and magnetic homogeneity across the junction. © 2001 American Institute of Physics.
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75.47.De Giant magnetoresistance
75.50.Dd Nonmetallic ferromagnetic materials
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.47.Gk Colossal magnetoresistance
68.37.Lp Transmission electron microscopy (TEM)
68.37.Ps Atomic force microscopy (AFM)
68.35.Ct Interface structure and roughness
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