Influence of an Fe cap layer on the structural and magnetic properties of Fe₄₉Pt₅₁/Fe bi-layers

The influences of an Fe cap layer on the structural and magnetic properties of FePt/Fe bi-layers are investigated. Compared with single FePt alloy films, a thin Fe layer can affect the crystalline orientation and improve the chemical ordering of L1₀ FePt films. Moreover, the coercivity increases when a thin Fe layer covers the FePt layer. Beyond a critical thickness, however, the Fe cover layer quickens the magnetization reversal of Fe₄₉Pt₅₁/Fe bi-layers by their exchange coupling.