Interfacial polarisation effect on the interlayer couplings in Co/Rh sandwiches |
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Authors: | A Dinia S Zoll M Gester D Stoeffler JP Jay K Ounadjela HAM van den Berg H Rakoto |
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Institution: | (1) IPCMS-GEMME (UMR 46 CNRS-ULP.), 23 rue du Loess, 67037 Strasbourg, France, FR;(2) Siemens AG, ZFE T MR 1, P.O. Box 3220, 91050 Erlangen, Germany, DE;(3) SNCMP (UMS 819 CNRS-UPS.), INSA, Complexe Scientifique de Rangueil, 31077 Toulouse, France, FR |
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Abstract: | The structural, magnetic and transport properties of Co/Rh sandwiches grown by ultra high vacuum evaporation and sputtering
have been studied. High-energy electron diffraction observations during the growth reveal that both Co and Rh layers have
been stabilised in the (111) fcc structure for the evaporated sandwiches. X-ray measurements performed on sputtered samples
show a predominant fcc polycrystalline structure of the stacks with a preferential (111) texture. Magnetisation and magnetoresistance
measurements show a very strong antiferromagnetic exchange coupling for thin Rh layers, reaching for 4.8? Rh, the strongest ever observed in exchange coupled systems. This value is in good agreement with the value of obtained by ab initio calculations for Co/Rh (hcp) superlattices. This is explained by the magnetic nature of the Co/Rh interfaces. Indeed, the
variation of the measured saturation magnetisation as a function of the Co layer thickness shows no evidence of Co moment
reduction for the Co atoms located at the interfaces, even for the very thin layers. The value of the preserved magnetic moments
of the cobalt atoms at the interfaces is confirmed by ab initio calculations for Co/Rh superlattices taking the intermixing into account.
Received: 18 February 1998 / Received in final form: 30 April 1998 /
Accepted: 29 May 1998 |
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Keywords: | PACS 75 70-i Magnetic films and multilayers - 75 70 Cn Interfacial magnetic properties (multilayers magnetic quantum wells superlattices magnetic heterostructures) - 75 70 Pa Giant magnetoresistance |
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