Structural and magnetic phase diagram of Tb/Fe multilayers determined by conversion electron Mössbauer spectrometry

Tb/Fe multilayers have been prepared by rf-pulverization on Si〈111〉 substrates. Conversion electron Mossbauer spectrometry was used to obtain information on the structure and the spin texture of the multilayers. A structural and magnetic diagram is proposed in the e Tb = 0.2−1.9 nm, e Fe = 0.2−3.3 nm thickness range. In the amorphous samples, the magnetic hyperfine field varies continously with the iron thickness and exhibits a maximum for e Fe ≅ 1.0 nm.