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5 Apr 1999

Volume 74, Issue 14, pp. 1933-2093

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Investigation on Ag/Pb(Zr0.53Ti0.47)O3/YBa2Cu3O7−δ three-terminal system with small gate area

B. T. Liu, Z. Hao, Y. F. Chen, B. Xu, H. Chen, F. Wu, B. R. Zhao, Yu. Kislinskii, and E. Stepantsov

Appl. Phys. Lett. 74, 2044 (1999); http://dx.doi.org/10.1063/1.123751 (3 pages) | Cited 7 times

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The three-terminal devices Ag/Pb(ZrxTi1−x)O3/YBa2Cu3O7−δ(Ag/PZT/YBCO) have been fabricated onto (100) SrTiO3 by pulsed laser deposition technique and photolithography. For the purpose of application, we specially selected the PZT layer with morphotropic phase boundary composition as the gate to lower the coercive fields and decrease the operating voltage. We tried to minimize the electrode area to 6×10−6 cm2 for deeply investigating the leakage problem and getting sufficient polarization of the PZT gate, also for the high integration in future application. From the process, we obtained the following results at 64 K: the saturation polarization and the remanent polarization reach 60 and 41 μC/cm2, respectively. The coercive field is lower than 37 kV/cm, and the breakdown field is ≥ 3×105 V/cm. The electric field effect measurement shows that the maximum modulation channel resistance ΔRDS/RDS is 3% under the gate voltage of ±9 V at 64 K (lower than the zero resistance temperature TC0, 70 K), at which the superconducting and normal state transition is driven by channel current IDS(IDS>Ic, Ic = 15 mA). © 1999 American Institute of Physics.
Show PACS
85.25.-j Superconducting devices
74.72.-h Cuprate superconductors
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
81.15.Fg Pulsed laser ablation deposition
77.22.Ej Polarization and depolarization
77.22.Jp Dielectric breakdown and space-charge effects
74.10.+v Occurrence, potential candidates
85.50.-n Dielectric, ferroelectric, and piezoelectric devices
74.45.+c Proximity effects; Andreev reflection; SN and SNS junctions

Low-field magnetostriction in an annealed Co–30% Fe alloy

L. H. Chen, T. J. Klemmer, H. Mavoori, and S. Jin

Appl. Phys. Lett. 74, 2047 (1999); http://dx.doi.org/10.1063/1.123752 (3 pages) | Cited 2 times

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Magnetostriction properties of a deformed and annealed Co–Fe alloy have been investigated. A significant magnetostriction value greater than ∼ 110×10−6 was obtained in a cold-rolled and recrystallized sample at a practical, low field of ∼100 Oe, while the as-cold-rolled sample gave a small magnetostriction of only ∼ 15×10−6 for the same applied field. Cold rolling and recrystallization produces much smaller magnetostriction in the longitudinal direction than the transverse direction in the low-field regime. The saturation magnetostriction of the recrystallized Co–Fe alloy was ∼ 140×10−6. The drastic dependence of the magnetostriction behavior on the alloy processing is tentatively attributed to the microstructure and texture changes brought about by the heat-treatment processing. The availability of such a high magnetostriction in low applied fields using a ductile and low-cost alloy material can be useful for various technical applications. © 1999 American Institute of Physics.
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75.80.+q Magnetomechanical effects, magnetostriction
75.50.Bb Fe and its alloys
81.40.Ef Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization
62.20.F- Deformation and plasticity
81.40.Lm Deformation, plasticity, and creep

Microstructure of epitaxial α-Fe2O3 grains in Ba-ferrite thin films grown on sapphire (001)

T. S. Cho, S. J. Doh, J. H. Je, and D. Y. Noh

Appl. Phys. Lett. 74, 2050 (1999); http://dx.doi.org/10.1063/1.123753 (3 pages) | Cited 7 times

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We revealed the existence of epitaxial α-Fe2O3 grains in Ba-ferrite thin films on sapphire (001) using synchrotron x-ray scattering. The antiferromagnetic α-Fe2O3 grains were formed during the crystallization of amorphous Ba-ferrite films grown on sapphire (001) by radio frequency sputtering deposition. The crystal domain size of the α-Fe2O3 grains was about 250 Å in the film plane, similar to that of the Ba-ferrite grains. The in-plane crystalline axis of the α-Fe2O3 was aligned to that of sapphire, while the Ba-ferrite film was rotated by 30° in the film plane. We confirm that the existence of these antiferromagnetic α-Fe2O3 grains greatly degraded magnetic properties of the Ba-ferrite films. © 1999 American Institute of Physics.
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68.55.-a Thin film structure and morphology
75.50.Gg Ferrimagnetics
75.70.Ak Magnetic properties of monolayers and thin films

High-Tc edge junctions with a Ga-doped YBa2Cu3O7−δ barrier and interface resistances

I. H. Song, E.-H. Lee, B. M. Kim, I. Song, and G. Park

Appl. Phys. Lett. 74, 2053 (1999); http://dx.doi.org/10.1063/1.123754 (3 pages) | Cited 5 times

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High-Tc ramp-edge junctions with a Ga-doped YBa2Cu3O7−δ barrier have been fabricated in the trilayer geometry of YBa2Cu3O7−δ/YBa2Cu2.79Ga0.21O7−δ/YBa2Cu3O7−δ on LaAlO3 single crystals. Interface resistances of the junctions were drastically reduced by using an in situ Ar plasma cleaning treatment. The Ga-doped YBa2Cu3O7−δ junctions with barrier thickness of 200 and 300 Å clearly exhibited resistively-shunted-junction-like current–voltage characteristics. The critical currents of the Ga-doped junctions were less sensitive to the variation of the barrier thickness compared to those of the other junctions. The increase of the barrier resistivity by Ga-doping and the in situ rf plasma cleaning treatment resulted in an enhancement of the junction reliability and reproducibility. © 1999 American Institute of Physics.
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74.78.-w Superconducting films and low-dimensional structures
74.72.-h Cuprate superconductors
74.50.+r Tunneling phenomena; Josephson effects
74.25.Sv Critical currents

Phase boundary structure in Nd–Fe–B sintered magnets

Ken Makita and Osamu Yamashita

Appl. Phys. Lett. 74, 2056 (1999); http://dx.doi.org/10.1063/1.123755 (3 pages) | Cited 40 times

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The interface between tetragonal Nd2Fe14B phase and Nd-rich grain boundary phase in Nd–Fe–B sintered magnets was investigated with high resolution transmission electron microscope. Selected area diffraction patterns of the Nd-rich phase can be indexed by face-centered-cubic (fcc) structure with the lattice constant of a = 0.548 nm. The orientation relationships between the two phases contacted directly with each other approximately agree with either of the following formulas: (110)tetra.//(110)fcc, [001]tetra.//[2math3]fcc, or (110)tetra.//(010)fcc, [001]tetra.//[math02]fcc. These preferred orientations would be the results which minimize the phase boundary energy during postsintering heat treatment. In addition, it may change the local crystal field as well as the strain at the outermost Nd3+ ion site of the tetragonal grain both of which affect the coercivity of the magnet. © 1999 American Institute of Physics.
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75.50.Ww Permanent magnets
75.50.Vv High coercivity materials
61.72.Mm Grain and twin boundaries
81.40.Ef Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.50.Bb Fe and its alloys
61.66.Dk Alloys
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