期刊
PHYSICAL REVIEW B
卷 79, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.094523
关键词
critical current density (superconductivity); ferromagnetic materials; magnetic superconductors; nickel alloys; palladium alloys; spin-orbit interactions; spin-spin interactions; superconducting junction devices; triplet state
资金
- Department of Energy [DE-FG02-06ER46341]
- U.S. Department of Energy (DOE) [DE-FG02-06ER46341] Funding Source: U.S. Department of Energy (DOE)
We have studied the variation in critical current in superconductor/ferromagnet/superconductor Josephson Junctions as a function of ferromagnet thickness using a weakly ferromagnetic alloy Pd82Ni12. Measurements were performed for the thickness range 32-100 nm, over which the critical current density decreases by 5 orders of magnitude. The critical current density oscillates with a period of pi x(4.4 +/- 0.1) nm, and decays over a characteristic length of 7.7 +/- 0.5 nm. There is no evidence of a crossover to a slower decay, which might indicate the presence of long-range spin-triplet pair correlations. We discuss possible reasons for their absence, including the possibility of strong spin-flip scattering in PdNi.
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