The Role of Interfaces in Interlayer Exchange Coupling

概要

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The role of alloyed atomic layers was studied in Fe/Cu/X_<(c)>Cu(1-c)/Cu/Fe(001). systems, where X=Ag, Cr, Fe. The experimental results and theoretical calculations show that the strength of the coupling mostly depends on the magnetic state of the foreign atoms. For foreign atoms with no long range ferromagnetic order the strength of the coupling is mostly affected by mismatch in the valence bands. Foreign atoms that are isoelectronic with the spacer atoms modify the coupling only due to lattice relaxations. The role of heterogeneous interfaces in Fe/Cr systems was studied using Fe-whisker/Cr/Cu, Ag, Mn/Fe(001) structures which were prepared by layer by layer epitaxial growth. The results using the samples with Cr/Cu/Fe and Cr/Ag/Fe interfaces indicate that the spin dependent reflectivities play a significant role in the exchange coupling through Cr(001). The Mn layers in Cr/Mn/Fe(001) have either ferromagnetic or compensated antiferromagnetic order, and can result in a significant enhancement of the interlayer exchange coupling.
社団法人日本磁気学会の論文
1999-01-20