Es. Mushailov et al., MAGNETIC-ORDERING IN MULTILAYER MONOATOMIC CO CU FILMS/, Journal of magnetism and magnetic materials, 138(1-2), 1994, pp. 207-210
The magnetic properties of monoatomic (approximately 0.3 nm) cobalt la
yers were studied in multilayer Co/Cu and Co/SiO2 systems and in a thr
ee-layer Cu/Co/Cu film structure. The saturation magnetization M and n
uclear spin-spin relaxation times T2 were measured as functions of the
copper layer thickness d(Cu). Also the frequency spectra of spin-echo
signals from Co-59 nuclei were measured. The main result obtained was
experimental evidence for the effect of copper conduction electrons o
n magnetic ordering in cobalt, which is strongly dependent on d(Cu). F
or d(Cu) = 0.2-0.3 nm, multilayer structures with monoatomic Co layers
exhibit three-dimensional (spatial) properties. As d grows, their pro
perties transform first into quasi-two-dimensional ones, and further i
nto such states when they are probably determined by the quantum size
effect for each individual Co layer.