Critical current oscillations of elliptical Josephson junctions with single-domain ferromagnetic layers
作者： Joseph A. Glick , Mazin A. Khasawneh , Bethany M. Niedzielski , Reza Loloee , W. P. Pratt
DOI: 10.1063/1.4989392
关键词:
摘要: Josephson junctions containing ferromagnetic layers are of considerable interest for the development practical cryogenic memory and superconducting qubits. Such exhibit a ground-state phase shift π certain ranges layer thicknesses. We present studies Nb based micron-scale elliptically shaped barriers Ni81Fe19 or Ni65Fe15Co20. By applying an external magnetic field, critical current is found to follow characteristic Fraunhofer patterns display sharp switching behavior suggestive single-domain magnets. The high quality enables us extract maximum value even when peak shifted significantly outside range data due moment layer. oscillates as function barrier thickness, indicating transitions in difference across ...
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