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Proceedings Paper

Epitaxial multilayers of ferromagnetic insulators with nonmagnetic metals and superconductors
Author(s): Gordon M. Roesler Jr.; M. E. Filipkowski; P. R. Broussard; Yves U. Idzerda; Michael S. Osofsky; Robert J. Soulen Jr.
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Paper Abstract

Novel electronic properties are observed in metals in contact with the ferromagnetic insulator europium monoxide (EuO). We have successfully prepared epitaxial bilayers and multilayers involving EuO and the metals V or Ag. With metal layers of 100 angstroms thickness or less, these structures exhibit a slope discontinuity in their resistance versus temperature at 90 K for V/EuO interfaces and at 50 K for Ag/EuO interfaces. For metal layers less than about 40 angstroms, a feature is also apparent in R(T) at 70 K, the Curie temperature of bulk EuO. The slope discontinuities are reminiscent of those observed at the Curie temperature of ferromagnetic metals. Kerr effect measurements confirm that the EuO exhibits ferromagnetic ordering at 70 K. In V/EuO structures, the V still displays superconductivity with a slightly depressed transition temperature. This suggests that such metal/ferromagnetic insulator structures may be used to prepare artificial ferromagnetic superconductors. The resistive transition is incomplete, suggesting small regions of isolated superconductivity within the sample, as has been predicted for certain special cases when a superconductor is in proximity to a ferromagnet.

Paper Details

Date Published: 29 June 1994
PDF: 6 pages
Proc. SPIE 2157, Superconducting Superlattices and Multilayers, (29 June 1994); doi: 10.1117/12.179175
Show Author Affiliations
Gordon M. Roesler Jr., Naval Research Lab. (United States)
M. E. Filipkowski, Naval Research Lab. (United States)
P. R. Broussard, Naval Research Lab. (United States)
Yves U. Idzerda, Naval Research Lab. (United States)
Michael S. Osofsky, Naval Research Lab. (United States)
Robert J. Soulen Jr., Naval Research Lab. (United States)

Published in SPIE Proceedings Vol. 2157:
Superconducting Superlattices and Multilayers
Ivan Bozovic, Editor(s)

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