Suppression of superconductivity due to spin imbalance in Co/Al/Co single electron transistor

Details Suppression of superconductivity due to spin imbalance in Co/Al/Co single electron transistor Suppression of superconductivity due to spin imbalance in Co/Al/Co single electron transistor

2002-11-07

arxiv.org/abs/cond-mat/0211129v1

J. Appl. Phys., 93, 8650 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 4 figures

Scientific paper

10.1063/1.1556284

Transport properties of ferromagnetic/non-magnetic/ferromagnetic single electron transistors are investigated as a function of external magnetic field, temperature, bias and gate voltage. By designing the magnetic electrodes to have different switching fields, a two-mode device is realized having two stable magnetization states, with the electrodes aligned in parallel and antiparallel. Magnetoresistance of approximately 100% is measured in Co/AlO$_{X}$/Al/AlO$_{X}$/Co double tunnel junction spin valves at low bias, with the Al spacer in the superconducting state. The effect is substantially reduced at high bias and temperatures above the $T_{C}$ of the Al. The experimental results are interpreted as due to spin imbalance of charge carriers resulting in suppression of the superconducting gap of the Al island.

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