Enhanced interfacial magnetic coupling of Gd /Fe multilayers.
The spatial extent zeta(AFM) and strength J(AFM) of the antiferromagnetic (AFM) exchange coupling at buried Gd /Fe interfaces in ferrimagnetic [Gd(50 A)Fe(15,35 A)](15) sputtered multilayers is obtained from combined x-ray resonance magnetic reflectivity and magnetic circular dichroism measurements. zeta(AFM) is 4.1(7) A or approximately 1-2 interatomic distances in bulk Gd and Fe; J(AFM) is 1050(90) K, comparable to the ferromagnetic exchange in bulk Fe.
Haskel
D
D
Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
Srajer
G
G
Lang
J C
JC
Pollmann
J
J
Nelson
C S
CS
Jiang
J S
JS
Bader
S D
SD