不同退火时间对[Ag／FePt]10多层膜磁性能和微结构的影响  

Microstructure and magnetic properties of [Ag/FePt]_(10) multilayer films with different annealed time

作　　者：董凯锋[1] 程晓敏[1] 鄢俊兵[1] 程伟明[1] 缪向水[1] 许小红[2] 王芳[2] 杨晓非[1] 

机构地区：[1]华中科技大学电子科学与技术系,湖北武汉430074 [2]山西师范大学化学与材料科学学院,山西临汾041004

出　　处：《功能材料》2009年第1期20-22,共3页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(60571010);湖北省自然科学基金重大资助项目(2007ABD001)

摘　　要：采用射频磁控溅射的方法,在玻璃基片上制备了不同Ag层厚度的[Ag/FePt 2nm]10多层薄膜,经550℃真空热处理后,得到L10有序结构的FePt薄膜。实验结果显示,FePt单层薄膜经550℃退火30min后其易磁化轴处于垂直方向和面内方向之间,而550℃退火60min后其易磁化轴处于垂直于膜面方向,垂直矫顽力和面内矫顽力分别为634和302kA/m;真空退火后[Ag/FePt]10多层膜表现为面内磁晶各向异性,550℃退火60min后[Ag 2.8nm/FePt 2nm]10多层薄膜垂直矫顽力和面内矫顽力分别为309和778kA/m,并且随着Ag层的加入,部分FePt颗粒已经被Ag原子隔开了,颗粒之间的交换耦合作用变弱了。The [Ag/FePt]10 multilayer films with different Ag thickness were deposited by RF magnetron sputtering on glass substrates, and the L10-FePt films were obtained after the as-deposited samples were subjected to vacuum annealing with different annealed time. Results show that after annealed at 550℃ for 30min the easy axis of the FePt 20nm single layer film for magnetization was distributed between the film normal and the film plane, hower after annealed at 550℃ for 60min, the FePt 20nm single layer film exhibited a high perpendicular coercivity of 634kA/m and a low in-plane coercivity of 302kA/m, which suggests that the film exhibited a high perpendicular anisotropy. After annealed at 550℃ for 60min,[Ag/FePt]10 multilayer films exhibited a high inplane anisotropy, and the[Ag 2.8nm/FePt 2nm]10 film exhibited a low perpendicular coercivity of 309kA/m and a high in-plane eoercivity of 778kA/m. During the annealing the Ag atoms diffused into the FePt rims, the coupling effect between the FePt grains was reduced.

关 键 词：FePt薄膜 矫顽力 退火时间 

分 类 号：TM271[一般工业技术—材料科学与工程]