MAGNETIC ANISOTROPY IN EuS-PbS MULTILAYERS

We present the results of ferromagnetic resonance studies of the thick ness dependence of magnetic anisotropy in 2 series of EuS—PbS multilayers grown on (111) BaF2 and (100) KC1 substrates with the EuS thickness vary ing in the range d = 6—70 A. The anisotropy constant K was found to follow the dependence K(cl) = Ky + 2K5/d, with the surface term Ks larger for layers grown on BaF2 as compared to FCC1. This difference is discussed in terms of different thermal stress-induced distortions of cubic crystal lattice of EuS. We found that the thickness of EuS layer required for the perpendicular (to the layer) magnetization is d < 2—3 A, i.e., it is below 1 monolayer. PACS numbers: 75.50.Pp, 75.70.Ak 1