Effect of splayed pins on vortex creep and critical currents

Journal Article · Fri Mar 31 23:00:00 EST 2000 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.62.R3612· OSTI ID:797829

Olson, C J ^[1]; Scalettar, R T; Zimanyi, G T; Gronbech-Jensen, N

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1. LBNL Library

We study the effects of splayed columnar pins on the vortex motion using realistic London Langevin simulations. At low currents vortex creep is strongly suppressed, whereas the critical current j{sub c} is enhanced only moderately. Splaying the pins generates an increasing energy barrier against vortex hopping, and leads to the forced entanglement of vortices, both of which suppress creep efficiently. On the other hand, splaying enhances kink nucleation and introduces intersecting pins, which cut off the energy barriers. Thus the j{sub c} enhancement is strongly parameter sensitive. We also characterize the angle dependence of j{sub c}, and the effect of different splaying geometries.

• Research Organization: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: USDOE Director, Office of Science. Office of Advanced Scientific Computing Research. Mathematical, Information, and Computational Sciences Division; National Science Foundation (US)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 797829
• Report Number(s): LBNL--45445
• Journal Information: Physical Review B, Journal Name: Physical Review B Journal Issue: 6 Vol. 62
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CREEP
CRITICAL CURRENT
NUCLEATION
VORTICES