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Oscillations of the Curie temperature and interlayer exchange coupling in magnetic trilayers

1999; American Physical Society; Volume: 59; Issue: 6 Linguagem: Inglês

10.1103/physrevb.59.r3938

1095-3795

A. Ney, F. Wilhelm, Michael Farle, P. Poulopoulos, Pankaj Srivastava, K. Baberschke,

Magnetism in coordination complexes

The onset of long-range magnetic order in exchange-coupled epitaxial Co/Cu/Ni trilayers, 2--4 monolayers (ML) each, on Cu(001) is studied by element-specific x-ray magnetic circular dichroism between 30 and 300 K in ultrahigh vacuum. Oscillations of the enhancement of the ordering temperature of Ni $(\ensuremath{\Delta}{T}_{\mathrm{Ni}})$ by more than 40 K are measured as a function of interlayer exchange interaction by varying the Cu(001) spacer thickness. Below a Cu thickness of 2.3 ML antiferromagnetic coupling is measured. The period, phase, and amplitude of the $\ensuremath{\Delta}{T}_{\mathrm{Ni}}$ oscillations are in excellent agreement with the theoretical prediction for the short- and long-period oscillations of the interlayer exchange coupling.