Learn More
Using a self-aligned fabrication process together with multiple-step aligned electron beam lithography, we have developed a nanopillar structure where a third contact can be made to any point within a thin-film multilayer stack. This substantially enhances the versatility of the device by providing the means to apply independent electrical biases to two(More)
The I-V characteristics of thin film microbridges containing 900 basal-plane-faced tilt boundaries (TBs) exhibit pronounced resonant structure. This structure is attributable to the presence of "beating modes" previously studied in high Q DC SQUID structures having substantial shunt capacitance and large inductance. Less pronounced but clear resonant(More)
The high degree of crystal stress and strain present at, and in the vicinity of, high angle grain boundary (GBJ), ramp edge Co doped SNS (Co-SNS), or interface engineered junctions (IEJ) can lead to localized and highly non-uniform regions of basal plane oxygen loss in YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// (YBCO). These oxygen inhomogeneities will, to a(More)
Nanopillar devices with an elliptical cross-section of about 130 nm /spl times/ 70 nm were studied. The devices were made by ion milling of a sputtered multilayer Cu 80 nm/Py 20 nm/Cu 6 nm/Py 2 nm/Cu 2 nm/Pt 30 nm (Py=Ni/sub 80/Fe/sub 20/) followed by planarization with silicon oxide and the deposition of a Cu top contact. Current is applied perpendicular(More)
We report on the epitaxial growth of YSr/sub 2/Cu/sub 2.75/Mo/sub 0.25/O/sub 7-/spl delta// (YSCMO) thin films by pulsed laser ablation, and discuss the superconducting find normal state transport properties of microbridges patterned from such films. To investigate the dopant oxygen mobility of this material, we have used electrical biases applied at near(More)
The authors are with Cornell University, Ithaca, NY 14853. Ilesanmi Adesida-Research Associate and Lecturer at NRRFSS Joseph Merrill Ballantyne-Director and Professor of Electrical Engineering Robert Allan Buhrman-Associate Professor of Applied and Engineering Physics and an Associate Director of NRRFSS Jeffrey D. Chinn-Graduate Student Lester F.(More)
We report on the effect of 200-500C ozone anneals on the resistivity versus temperature (RT) and Raman spectra characteristics of YBa/sub 2/Cu/sub 3-x/Co/sub x/O/sub 2/ (Co-YBCO) thin films, with x=0.3, 0.5, 0.75, and 1.0. Cold wall anneals are conducted at /spl sim/1 aim. of a flowing O/sub 2//O/sub 3/ mixture with /spl sim/2% O/sub 3/ by weight. The(More)
We report on the micro-Raman spectroscopy study of thin films of YBa/sub 2/Cu/sub 3-x/Co/sub x/O/sub 7-/spl delta// grown by laser ablation. Depending on the growth pressure, the films are found to be either homogenous or inhomogeneous on a scale /spl Gt/2 /spl mu/m. In either case the films are, on average, oxygen deficient, but this deficit can be(More)
  • R. Buhrman
  • Digest of INTERMAG 2003. International Magnetics…
  • 2003
In this paper, we discuss several nanoprocessing procedures and their respective merits and challenges for the successful fabrication of effective spin transfer devices. Recent results of spin transfer studies that have been made with these magnetic nanopillars will also be summarised. These includes several critical tests of current theoretical models of(More)