Effect of Cr100−xTix (x = 0-19 at.%) alloy underlayers on the high coercivity of FePt thin film below the substrate temperature of 250 °C

► Ordering process temperature of FePt films was reduced below 250 °C by CrTi underlayer. ► In-plane coercivity of FePt films is highly maintained to 6000 Oe at 250 °C by CrTi underlayer. ► CrTi underlayer is beneficial in view of a cost comparing to other metal underlayers.