.512 北京科技大学学报 第30卷 本可以忽略,磁化反转过渡为非一致反转 [3]Chen JS.Lim B C.Wang J P.Controlling the erystallographic orientation and the axis of magnetic anisotropy in Lio FePt films. 3结论 Appl Phys Lett.2002.81(10):1848 [4]Yan M L.Zeng H.Powers N.et al.Lio.(001)oriented FePt: FePt颗粒膜的非磁性介质所占比例对其反磁 B203 composite films for perpendicular recording.J Appl Phys. 化过程有着很大的影响,当非磁性介质所占比例较 2002,91(10):8471 小时,磁性颗粒间相互作用强,磁矩反转模式是一致 [5]Wu X W,Guslienko K Y,Chantrell R W.et al.Magnetic 反转,随着非磁性介质比例的提高,FPt颗粒膜的 anisotropy and thermal stability study on FePt nanoparticle assem- 磁矩反转一致性逐渐下降,当FPt颗粒之间间距 bly.Appl Phys Lett,2003,82(20):3475 [6]Yan M L.Xu Y F.Li X Z,et al.Highly (001)-oriented Ni-doped 为3~4nm时,颗粒间交换作用可被忽略,磁化反转 Lo FePt films and their magnetic properties.JAppl Phys.2005. 为非一致反转.FPt颗粒膜的矫顽力在磁矩反转模 97(10):309 式的转变过程有着显著变化,在一致反转时,矫顽 [7]Yan M L.Li X Z,Gao L,et al.Fabrication of nonepitaxially 力随着非磁性介质比例的增加而增大,但增幅较小; grown double-layered FePtC/FeCoNi thin films for perpendicular 当反转模式转变为非一致反转后,矫顽力迅速增大, recording.Appl Phys Lett.2003.83(16):3332 [8]Zhou J.Skomski R.Kashyap A.et al.Highly coercive thin film 参考文献 nanostructures.J Magn Magn Mater.2005,290:227 [9]Yang T,Ahmad E.Swuki T.FePt-Ag nanocomposite film with [1]Kanazawa H.Lauhoff G.Swuki T.Magnetic and structural perpendicular magnetic anisotropy.JAppl Phys.2002.91(10): properties of (Co,Feo-)soPtso alloy thin films.J Appl Phys 6860 2000,87(9):6143 [10]Zhao S F,Jin H M,Wang X F,et al.Demagnetization curves [2]Sun S H.Murray C B.Weller D.et al.Monodisperse FePt at different temperatures for single phase nanocrystalline Nd-Fe- nanoparticles and ferromagnetic FePt nano-crustal super lattices. B magnets studied micromagnetically Phys Condens Matter. Science,2000,287:1989 2001,13,3865本可以忽略磁化反转过渡为非一致反转. 3 结论 FePt 颗粒膜的非磁性介质所占比例对其反磁 化过程有着很大的影响.当非磁性介质所占比例较 小时磁性颗粒间相互作用强磁矩反转模式是一致 反转.随着非磁性介质比例的提高FePt 颗粒膜的 磁矩反转一致性逐渐下降.当 FePt 颗粒之间间距 为3~4nm 时颗粒间交换作用可被忽略磁化反转 为非一致反转.FePt 颗粒膜的矫顽力在磁矩反转模 式的转变过程有着显著变化.在一致反转时矫顽 力随着非磁性介质比例的增加而增大但增幅较小; 当反转模式转变为非一致反转后矫顽力迅速增大. 参 考 文 献 [1] Kanazawa HLauhoff GSuzuki T.Magnetic and structural properties of (Co xFe100— x)50Pt50 alloy thin films.J Appl Phys 200087(9):6143 [2] Sun S HMurray C BWeller Det al.Monodisperse FePt nanoparticles and ferromagnetic FePt nano-crustal super lattices. Science2000287:1989 [3] Chen J SLim B CWang J P.Controlling the crystallographic orientation and the axis of magnetic anisotropy in L10FePt films. Appl Phys Lett200281(10):1848 [4] Yan M LZeng HPowers Net al.L10(001)-oriented FePt∶ B2O3composite films for perpendicular recording.J Appl Phys 200291(10):8471 [5] Wu X WGuslienko K YChantrell R Wet al.Magnetic anisotropy and thermal stability study on FePt nanoparticle assembly.Appl Phys Lett200382(20):3475 [6] Yan M LXu Y FLi X Zet al.Highly (001)-oriented N-i doped L10FePt films and their magnetic properties.J Appl Phys2005 97(10):309 [7] Yan M LLi X ZGao Let al.Fabrication of nonepitaxially grown double-layered FePt∶C/FeCoNi thin films for perpendicular recording.Appl Phys Lett200383(16):3332 [8] Zhou JSkomski RKashyap Aet al.Highly coercive thin-film nanostructures.J Magn Magn Mater2005290:227 [9] Yang TAhmad ESuzuki T.FePt-Ag nanocomposite film with perpendicular magnetic anisotropy.J Appl Phys200291(10): 6860 [10] Zhao S FJin H MWang X Fet al.Demagnetization curves at different temperatures for single-phase nanocrystalline Nd-FeB magnets studied micromagnetically.J Phys Condens Matter 200113:3865 ·512· 北 京 科 技 大 学 学 报 第30卷