Pd magnetism induced by indirect interlayer exchange coupling

Authors :: Bailey, W. E.
Ghosh, A.
Auffret, S.
Gautier, E.
Ebels, U.
Wilhelm, F.
Rogalev, A.
Source :: PRB 86 144403 (2012)
Publication Year :: 2012
Abstract: We show that very large paramagnetic moments are created in ultrathin Pd layers through indirect interlayer exchange coupling. Pd $L$-edge x-ray magnetic circular dichroism measurements show Pd moments in [Pd(2.5nm)/Cu(3nm)/Ni$_{81}$Fe$_{19}$(5nm)/Cu(3nm)]$_{20}$ superlattices which are ferromagnetically aligned with the applied field and nearly 3% the size of Pd moments created in directly exchange coupled [Pd(2.5nm)/Ni$_{81}$Fe$_{19}$(5nm)]$_{20}$ superlattices. The induced moment is two orders of magnitude larger than that expected from RKKY exchange acting on the bulk paramagnetic susceptibility of Pd.<br />Comment: 5 pages, 3 figures, to appear in Phys. Rev. B