Depth-dependent magnetism of layered superconductors [electronic resource] : Nb/Si.

Published:: Washington, D.C. : United States. Dept. of Energy, 1997.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: 9 pages : digital, PDF file
Additional Creators:: Argonne National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

We have studied magnetic field penetration and vortex line formation in a [Nb(100 Å)/Si(15 Å)]x20 multilayer by magnetization and polarized neutron reflection. With the magnetic field applied parallel to the surface, the magnetization revealed the presence of a kink above H{sub cl} indicative of transitions between one row of fluxoids and two rows of fluxoids parallel to the surface. The spin-dependence of neutron reflectivity below H{sub cl} was consistent with a penetration depth of 1200 Å, substantially larger than that of bulk Nb. In the mixed phase (H{sub ext} > H{sub cl}) the field was found to penetrate the surface, with a slope as found in the case of H{sub ext} < H{sub cl}. At H{sub ext} > H{sub cl} vortex forms in addition to surface penetration. A modulation of the vortex fields was found with the periodicity of the Nb/Si bilayers as evidenced by the spin dependence of the reflectivity at the first Bragg peak of the multilayer.

Report Numbers:

E 1.99:anl/msd/cp-94973
anl/msd/cp-94973

Subject(s):

Materials Science

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Note:

Published through SciTech Connect.
12/02/1997.
"anl/msd/cp-94973"
MMM Intermag Conference, San Francisco, CA (US), 01/06/1998--01/09/1998.
Osgood, R. M.; Felcher, G. P.; Fullerton, E. E.; Yusuf, S. M.

Funding Information:

W-31-109-ENG-38

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