Ag层厚度对FePd薄膜的结构和磁性能的影响

Effect of thickness of Ag layer on the structure and magnetic properties of FePd films

摘要:

采用磁控溅射的方法，在石英玻璃上制备了Agx/FePd(67.5nm)(x=3.875、7.75、15.50、31、38.75 nm)和FePd(67.5nm)/Agx(x=7.75、15.50、31nm)薄膜，研究了Ag对600℃退火不同时间的FePd/Ag、Ag/FePd薄膜的影响。结果显示，无论Ag沉积在FePd薄膜顶层还是底层，Ag层的加入都能加快薄膜从面心立方（FCC）到面心四方（FCT）的相转变。Ag能极大增强FePd薄膜的矫顽力。比较Ag/FePd和FePd/Ag薄膜，Ag/FePd薄膜中的部分样品有沿某一方向优先生长的趋势，更利于实际应用。在Ag/FePd薄膜中晶粒易磁化轴平行面内，当顶层Ag厚度为31nm时，薄膜有很大的面内矫顽力2.8kOe和很小的垂直方向矫顽力1.04kOe。

Abstract:

A series of FePd based alloy films were deposited on glass substrates by DC magnetron sputtering. In order to find the role of the Ag layer in disorder-order of FePd film, it was studied that the Ag layer effected on Agx/FePd(67.5nm)(x=3.875、7.75、15.50、31、38.75 nm) and FePd(67.5nm)/Agx(x=7.75、15.50、31nm) films annealed at 600℃ for different time. The results showed that the Ag layer could accelerate phase transition from FCC (face-centered cubic) to FCT (face-centered tetragonal) in films and greatly enhance the coercivity of FePd films. Compared Ag/FePd with FePd/Ag films, some samples of Ag/FePd films have highly preferred orientation. The magnetic easy axis of the crystallites in Ag/FePd film is in-plane of substrate. When the thickness of Ag toplayer is equal to 31 nm, the film has a very large in-plane coercivity of 2.8 kOe and a very low out-of-plane coercivity of 1.04 kOe.