Interlayer segregation in magnetic multilayers and its influence on exchange coupling

Yu, G. H.; Li, M. H.; Zhu, F. W.; Jiang, H. W.; Lai, W. Y.; Chai, C. L.
January 2003
Applied Physics Letters;1/6/2003, Vol. 82 Issue 1, p94
Academic Journal
Experimental results show that the exchange coupling field (H[sub ex]) of NiFe/FeMn for Ta/NiFe/FeMn/ Ta multilayers is higher than that for spin-valve multilayers Ta/NiFe/Cu/NiFe/FeMn/Ta. X-ray photoelectron spectroscopy shows that Cu atoms segregate to the NiFe/FeMn interface for Ta/NiFe/ Cu/NiFe/FeMn/Ta multilayers. While studying Ta/X(X= Bi,Pb,Ag,In)/NiFe/FeMn multilayers, we also find that X atoms segregate to the NiFe/FeMn interface, which results in a decrease of the H[sub ex]. However, a small amount of Bi, Pb, etc. deposited between Cu and pinned NiFe layer for Ta/NiFe/ Cu/NiFe/FeMn/Ta multilayers can increase H[sub ex].


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