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Phys. Rev. Lett. 78, 134–137 (1997)

[Issue 1 – 6 January 1997 ]

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Periodic Enhancement of the Electron-Electron Interactions and the Magnetoresistance in Magnetic Co/(Cr/Ag)/Co Multilayers

F. G. Aliev, E. Kunnen, K. Temst, K. Mae, G. Verbanck, J. Barnas, V. V. Moshchalkov, and Y. Bruynseraede

Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven, Celestijnenlaan 200D, Leuven B 3001, Belgium

Electrical transport and magneto-optical Kerr effect have been measured on Co/(Cr/Ag)/Co multilayers in which the thickness lambda of the bimetallic nonmagnetic spacer Cr/Ag varies from 0 to 35 Å. The measurements clearly indicate the presence of antiferromagnetic coupling for 9< lambda <23 Å. At low temperatures (T<20 K), the resistivity shows a logarithmic increase which is most probably caused by the two-dimensional electron-electron interactions. The magnitude of the log ₁₀T term and of the negative magnetoresistance varies periodically with a period corresponding approximately to one monolayer of Cr.

©1997 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v78/p134
DOI: 10.1103/PhysRevLett.78.134
PACS: 75.70.Cn, 73.50.Jt, 73.50.Yg, 78.66.Bz

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