利用FeAl下底层在低温条件下制备L10相FePt纳米颗粒

用FeAl合金作为下底层，用MgO作为中间层，在MgO（001）基片上生长了FePt薄膜．对FeAl下底层在300℃以上进行热处理，可以使其相结构转变为有序的B2相．热处理温度为400℃时，FeAl下底层内因热运动产生的空位没有在表面发生聚集，因而其表面最为平整．由于MgO，FeAl和FePt三者间良好的晶格匹配关系，使得FePt薄膜的生长具有垂直取向．FeAl下底层可以有效地降低FePt薄膜的相转变温度，而MgO中间层可以有效地避免层问扩散．在400℃的较低温度条件下，获得了尺寸约为10nrn的垂直取向L10相FePt均匀颗粒，室温矫顽力达到～20kOe．这种薄膜有希望应用于垂直磁记录介质．

Synthesis of L10 FePt nanograins at lower temperature by inserting FeAI underlayer

With inserted FeAl underlayer and MgO intermediatelayer, FePt thin films were sputtered on MgO（001） substrates. FeAl layer transforms into ordered B2 phase by annealing at temperatures of Ta/〉 300℃, and has the flattest surface at Ta = 400℃, as the thermal vacancies do not concentrate on the surface. Due to the matching of lattice among MgO, FeAI and FePt, the epitaxially grown FePt films show obvious （001） textures. The FeAl underlayer significantly reduces the temperature for formation of ordered L10 FePt, and the MgO intermediatelayer effectively prevents from the interlayer diffusion. At a lower circumstance temperature of 400℃, L10 FePt grains with relatively uniform size of -10 nm can be synthesized. The coercivity measured at room temperature is -20 kOe. Such particular films have the potential application in perpendicular magnetic recording media.