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Electron Holography of Flux Lattices in Niobium

Published online by Cambridge University Press:  21 February 2011

J.E. Bonevich ,
K. Harada ,
T. Matsuda ,
H. Kasai ,
T. Yoshida ,
G. Pozzi  and
A. Tonomura
J.E. Bonevich
Affiliation:
Hitachi Advanced Research Laboratory, Hatoyama, Saitama 350-03, JAPAN
K. Harada
Affiliation:
Hitachi Advanced Research Laboratory, Hatoyama, Saitama 350-03, JAPAN
T. Matsuda
Affiliation:
Hitachi Advanced Research Laboratory, Hatoyama, Saitama 350-03, JAPAN
H. Kasai
Affiliation:
Hitachi Advanced Research Laboratory, Hatoyama, Saitama 350-03, JAPAN
T. Yoshida
Affiliation:
Hitachi Advanced Research Laboratory, Hatoyama, Saitama 350-03, JAPAN
G. Pozzi
Affiliation:
Dept. of Physics, Univ. of Bologna, via Iternio 46, 40126 Bologna, ITALIA
A. Tonomura
Affiliation:
Hitachi Advanced Research Laboratory, Hatoyama, Saitama 350-03, JAPAN
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Abstract

Magnetic lines of force penetrating a superconducting thin foil have been investigated by means of electron holography. A field-emission TEM with a specially constructed cold stage was used to cool a Nb thin foil down to 4.5 K and apply magnetic fields up to 100 G. The specimen is tilted by 45° to both the electron beam and the magnetic field (applied horizontally) allowing the 2-D lattice of penetrating flux-lines to be discerned. The phase distribution of electrons transmitted through the specimen were quantitatively measured. Interference micrographs revealed tiny regions where the phase distribution rapidly changed. These regions coincided spatially with the spot-like contrast observed by Lorentz microscopy and were found to be quantized vortices containing a flux of h/2e. The experimental results were in good agreement with those predicted by theoretical simulations. Experiments exploring the vortex inner core structure at high resolution are presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 332: Symposium U – Determining Nanoscale Physical Properties of Materials by Microscopy and Spectroscopy , 1994 , 219
Copyright
Copyright © Materials Research Society 1994

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References

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