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Optimized thickness of superconducting aluminum electrodes for measurement of spin polarization with MgO tunnel barriers
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10.1063/1.2739333
/content/aip/journal/apl/90/20/10.1063/1.2739333
http://aip.metastore.ingenta.com/content/aip/journal/apl/90/20/10.1063/1.2739333
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) (a) Room temperature resistance of the Al electrode in the structure vs its thickness for various annealing temperatures. The inset shows the Al thickness below which no current passes through the electrode vs annealing temperature . (b) of the Al layer in the structure , inferred from resistance vs temperature curves in a in-plane field vs for unannealed (NA) and annealed (AN) samples at the maximum temperature before Al electrode breakdown. These annealing temperatures are shown in Fig. 3. The inset shows an optical micrograph of the device composed of the lower electrode (A), isolation pads (B), and the upper superconducting electrode (C). Note that C is long and wide.

Image of FIG. 2.
FIG. 2.

(Color online) Conductance vs bias voltage (symbols) for various Al thicknesses at and . Left: as-grown; right: after annealing at the indicated temperatures. The red and blue lines correspond to fits of the data using tunneling spin polarization values indicated in the panels, and other fitting parameters given in Fig. 4(a). The device structure is Al.

Image of FIG. 3.
FIG. 3.

(Color online) Conductance vs bias voltage (symbols) for various Al thicknesses at and . Left: as-grown; right: after annealing at the indicated temperatures. The red and blue lines correspond to fits of the data using tunneling spin polarization values indicated in the panels, and other fitting parameters given in Fig. 4(b). The device structure is Al.

Image of FIG. 4.
FIG. 4.

(Color online) Plot of STS fitting parameters vs Al thickness for various annealing temperatures, where filled symbols correspond to unannealed (NA) and open symbols to annealed (AN) samples. (a) and (b) correspond to fits to the data in Figs. 2 and 3, respectively: (squares), (triangles), and (circles). is in all cases.

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/content/aip/journal/apl/90/20/10.1063/1.2739333
2007-05-15
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Optimized thickness of superconducting aluminum electrodes for measurement of spin polarization with MgO tunnel barriers
http://aip.metastore.ingenta.com/content/aip/journal/apl/90/20/10.1063/1.2739333
10.1063/1.2739333
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