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为减少FePt纳米薄膜退火过程中晶粒团聚长大,进行了在外加强磁场条件下退火实验。对化学法制备的FePt纳米薄膜,经热处理后外加磁场,并使用X射线衍射仪、透射电子显微镜、扫描电子显微镜、振动样品磁强计表征薄膜的结构、晶粒尺寸和磁性能。实验发现:外加7.96MA.m-1磁场450℃退火,样品即开始有序化相变;外加7.96MA.m-1磁场600℃退火,样品有序度要高于常规退火样品;外加1.59～6.37MA.m-1磁场550℃退火,样品晶粒明显细化、矫顽力明显提高。因此,强磁场退火能降低FePt薄膜有序化相变温度,提高有序度、细化晶粒和提高矫顽力。
In order to reduce the reunion of the FePt nanofilm during annealing, an annealing experiment under external magnetic field was carried out. The FePt nanofilm prepared by chemical method was heat-treated and applied with a magnetic field. The structure, grain size and magnetic properties of the film were characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy and vibrating sample magnetometer. The experimental results show that the samples are annealed at 450 ℃ with an applied field of 7.96 MA.m-1, and the samples are ordered to undergo phase transformation. In addition, a 7.96 MA.m-1 magnetic field is annealed at 600 ℃, 6.37MA.m-1 magnetic field annealing at 550 ℃, the sample grain refinement significantly increased coercivity. Therefore, the strong magnetic field annealing can reduce the orderly transformation temperature of the FePt thin films, improve the degree of ordering, refine the grains and improve the coercive force.