垂直取向FePt/Ag纳米颗粒薄膜的结构和磁性  

Structure and magnetic properties of FePt/Ag nano-granular films with perpendicular magnetic anisotropy

作　　者：李宝河[1] 黄阀[1] 杨涛[1] 冯春[1] 翟中海[1] 朱逢吾[1] 

机构地区：[1]北京科技大学材料物理与化学系

出　　处：《物理学报》2005年第8期3867-3871,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:50301002);北京市科技新星计划(批准号:H020821290120)资助的课题.~~

摘　　要：用磁控溅射法在单晶MgO(100)基片上制备了[FePt2nm/Agdnm]10多层膜,经真空热处理后,得到具有高矫顽力的垂直取向L10-FePt/Ag颗粒膜.x射线衍射结果表明,在250℃的热基片上溅射,当Ag层厚度d=3—11nm时,FePt颗粒具有很好的[001]取向,随着Ag层厚度的增加,FePt颗粒尺寸减小.[FePt2nm/Ag9nm]10经过600℃真空热处理15min后,颗粒大小仅约8nm,垂直矫顽力达到692kA/m.这种无磁耦合作用的颗粒膜,适合用作超高密度的垂直磁记录介质.[FePt 2 nm/Ag d nm](10) ( d = 0-11) multilayers were prepared on single crystal MgO( 100) substrates kept at room temperature and 250 degrees C by means of magnetosputtering. L1(0)-FePt/Ag granular films with perpendicular magnetic anisotropy and high coercivity have been obtained after vacuum annealing the multilayers deposited on substrates kept at 250 degrees C for 15 min. Xray diffraction results indicate that FePt particles have a strong [001] orientation. The size of FePt particles decreases with the increase of the thickness of Ag layer. After vacuum annealing the [Fept 2 nm/Ag 9 nm]10 films at 600 degrees C for 15 min, FePt/Ag granular films are obtained with only 8 nm of particle size and 692 Win of coercivity. Isothermal magnetization remanence and de-demagnetization remanence measurements show that no magnetic exchange coupling between magnetic particles can be observed. Such a kind of films is suitable for future ultra-density perpendicular magnetic recording medium.

关 键 词：垂直取向 Ag 纳米颗粒 垂直磁记录介质 真空热处理 磁性 结构 薄膜 磁控溅射法 x射线衍射 磁耦合作用 高矫顽力 颗粒尺寸 颗粒大小 超高密度 颗粒膜 多层膜 T颗粒 FEP 600 基片 厚度 

分 类 号：TB383[一般工业技术—材料科学与工程]