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Examines the measurement of the anisotropic properties of Bi2223/Ag tapes with and without the silver sheath. Relationship between the resistivity anisotropy ratio and rolling plane; Use of the standard four-probe method in measuring anisotropic transport properties; Description of critical current scaling as a function of the angle theta.

Investigates ab-plane anisotropy of the critical currents in twinned YBa[sub 2]Cu[sub 3]O[sub 7-delta] superconductor films. Deposition of films on crystalline yttria-stabilized zirconia (YSZ); Effect of the alignment of the twin boundary mosaic diagonal; Nucleation of the YSZ buffer layer in large grains.

We argue that superconductor/ferromagnet multilayers of nanoscale period should exhibit strong pinning of vortices by the magnetic domain structure in magnetic fields below the coercive field when ferromagnetic layers exhibit strong perpendicular magnetic anisotropy. The estimated maximum magnetic pinning energy for single vortex in such a system is about 100 times larger than the pinning energy by columnar defects. This pinning energy may provide critical currents as high as 10[sup 6]-10[sup 7] A/cm[sup 2] at high temperatures (but not very close to T[sub c]) at least in magnetic fields below 0.1 T. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR]