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28 Jul 2003

Volume 83, Issue 4, pp. 593-811

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Appl. Phys. Lett. 83, 611 (2003); http://dx.doi.org/10.1063/1.1595724 (3 pages)

Chung-Chih Wu, Chieh-Wei Chen, and Ting-Yi Cho
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Structural and magnetic properties of ultrathin epitaxial La0.7Ca0.3MnO3 manganite films: Strain versus finite size effects

A. de Andrés, J. Rubio, G. Castro, S. Taboada, J. L. Martínez, and J. M. Colino

Appl. Phys. Lett. 83, 713 (2003); http://dx.doi.org/10.1063/1.1594838 (3 pages) | Cited 32 times

Online Publication Date: 22 July 2003

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We present a structural and magnetic study of La0.7Ca0.3MnO3 epitaxial films (the thickness ranges from 2.4 to 80 nm) on SrTiO3. Their structure, as obtained by x-ray diffraction, is orthorhombic with a 45° rotated 2×2 square lattice, referred to the SrTiO3 substrate, in the film plane. The 2.4 nm film adopts a different structure as evidenced by the extinction of particular diffraction peaks and supported by the behavior of the size of the in-plane structural domains. While no important structural changes are detected for the other films as the layer thickness is reduced, Tc decreases drastically while the remanent magnetization is constant. Tc follows the functional dependence of a mean field approximation for the limitation of the divergence of the spin–spin correlations by the film thickness. © 2003 American Institute of Physics.
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75.70.Ak Magnetic properties of monolayers and thin films
68.55.-a Thin film structure and morphology
75.50.Dd Nonmetallic ferromagnetic materials
75.47.Lx Magnetic oxides
68.60.Bs Mechanical and acoustical properties
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)

Nb/yttria-stabilized-zirconia/Nb nonhysteretic Josephson junctions

S. K. H. Lam and S. Gnanarajan

Appl. Phys. Lett. 83, 716 (2003); http://dx.doi.org/10.1063/1.1595718 (3 pages) | Cited 2 times

Online Publication Date: 22 July 2003

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Yttria-stabilized zirconia (YSZ) is used as an insulating barrier for the fabrication of niobium edge junctions. Using the ion beam assisted deposition technique, Nb/YSZ/Nb edge junctions with YSZ thin film of a few nanometers in thickness have been fabricated. The junctions are nonhysteretic with critical current densities up to 4 mA/μm2 and critical current normal resistance products of ∼1 mV. © 2003 American Institute of Physics.
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74.50.+r Tunneling phenomena; Josephson effects
81.15.Jj Ion and electron beam-assisted deposition; ion plating
74.25.Sv Critical currents

Systematic analyses of anomalous torque curves in granular BaFe12O19/SiO2/Si thin films

A. Lisfi, J. C. Lodder, and C. M. Williams

Appl. Phys. Lett. 83, 719 (2003); http://dx.doi.org/10.1063/1.1596386 (3 pages) | Cited 3 times

Online Publication Date: 22 July 2003

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An anomaly has been observed in the magnetic torque curve of BaFe12O19 films grown on a SiO2/Si substrate. The kink in the torque curve has a strong dependence on the film thickness and appears when the field direction is close to the film plane. Structural analyses together with the support of magnetic loop measurements reveal a polycrystalline structure, with magnetic properties strongly dependent on film thickness. At low thicknesses, a granular structure with a perpendicular c-axis is dominant, whereas, at large thicknesses, a new texture with a tilted c-axis (61° from the film plane) is well developed. By considering the contribution of both types of grains, the shape of torque curve is well predicted and the kink origin is attributed to the tilt of the c-axis. © 2003 American Institute of Physics.
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75.70.Ak Magnetic properties of monolayers and thin films
75.50.Gg Ferrimagnetics
75.50.Tt Fine-particle systems; nanocrystalline materials
68.55.-a Thin film structure and morphology
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

“Giant” Josephson proximity effect

V. Kresin, Yu. Ovchinnikov, and S. Wolf

Appl. Phys. Lett. 83, 722 (2003); http://dx.doi.org/10.1063/1.1596732 (3 pages) | Cited 13 times

Online Publication Date: 22 July 2003

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The “giant” Josephson current through the superconductor–normal–superconductor (S–N′–S) junction where the barrier N′ is an underdoped cuprate is explained. The thickness of N′ greatly exceeds the coherence length. The origin of this phenomenon is related to the origin of the metallic pseudogap state. The ability of a giant barrier to transfer a Josephson current is due to the inhomogeneous nature of the barrier and the presence of the superconducting “islands” embedded in the normal metallic matrix. © 2003 American Institute of Physics.
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74.50.+r Tunneling phenomena; Josephson effects
74.25.Jb Electronic structure (photoemission, etc.)
74.25.Ha Magnetic properties including vortex structures and related phenomena
74.20.Rp Pairing symmetries (other than s-wave)

Spin-polarized injection into YBaCu3O7 grain boundary junctions

J. Ireland, R. Chakalov, M. S. Colclough, and C. M. Muirhead

Appl. Phys. Lett. 83, 725 (2003); http://dx.doi.org/10.1063/1.1596383 (3 pages) | Cited 2 times

Online Publication Date: 22 July 2003

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YBa2Cu3O7/SrTiO3/La0.67Ca0.33MnO3 trilayer thin films grown on bicrystal substrates were patterned into a structure that allows the injection of spin-polarized current into the region of a grain boundary junction (GBJ). The transfer length LT was determined to ensure that injection was over the entire device width, in contrast to previously reported experiments. Currents up to some 100 times the junction critical current I0 and area density 108 A m−2, have been injected into the GBJ region by using an offset current method. The I0(B) characteristics of the GBJ under injection suggest that the suppression of I0 can be explained by a combination of heating and self-field effects, without any need to invoke the spin-polarized nature of the injected current. We find no evidence of direct injection into the junction. © 2003 American Institute of Physics.
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74.78.-w Superconducting films and low-dimensional structures
61.72.Mm Grain and twin boundaries
74.25.Sv Critical currents
72.25.Hg Electrical injection of spin polarized carriers
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