Tunneling density of states as a function of thickness in superconductor/ strong ferromagnet bilayers

Journal Article · Thu Apr 29 00:00:00 EDT 2010 · Submitted to Physical Review B

OSTI ID:979044

Reymond, S

We have made an experimental study of the tunneling density of states (DOS) in strong ferromagnetic thin films (CoFe) in proximity with a thick superconducting film (Nb) as a function of d{sub F}, the ferromagnetic thickness. Remarkably, we find that as d{sub F} increases, the superconducting DOS exhibits a scaling behavior in which the deviations from the normal-state conductance have a universal shape that decreases exponentially in amplitude with characteristic length d* {approx} 0.4 nm. We do not see oscillations in the DOS as a function of d{sub F}, as expected from predictions based on the Usadel equations, although an oscillation in T{sub c}(d{sub F}) has been seen in the same materials.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 979044
• Report Number(s): SLAC-PUB-13945; TRN: US201010%%361
• Journal Information: Submitted to Physical Review B, Journal Name: Submitted to Physical Review B
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLITUDES
OSCILLATIONS
SHAPE
SUPERCONDUCTING FILMS
THICKNESS
THIN FILMS
TUNNELING
MATSCI