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垂直取向FePt/Ag纳米颗粒薄膜的结构和磁性

李宝河 黄 阀 杨 涛 冯 春 翟中海 朱逢吾

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垂直取向FePt/Ag纳米颗粒薄膜的结构和磁性

李宝河, 黄 阀, 杨 涛, 冯 春, 翟中海, 朱逢吾

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

Li Bao-He, Hwang Pol, Yang Tao, Feng Chun, Zhai Zhong-Hai, Zhu Feng-Wu
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  • 用磁控溅射法在单晶MgO(100)基片上制备了[FePt 2 nm/Ag dnm]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—11 nm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.[FePt 2 nm/Ag 9 nm]10经过6 00 ℃真空热处理15 min后,颗粒大小仅约8 nm,垂直矫顽力达到692 kA/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 ℃ by means of magnetosputtering. L10-FePt/Ag granular films with perpendicular magn etic anis otropy and high coercivity have been obtained after vacuum annealing the multila yers deposited on substrates kept at 250 ℃ for 15 min. X-ray diffraction result s indicate that FePt particles have a strong [001] orientation. The size of Fe Pt particles decreases with the increase of the thickness of Ag layer. After vac uum annealing the [FePt 2 nm/Ag 9 nm]10 films at 600 ℃ for 15 min, FePt /Ag granular films are obtained with only 8 nm of particle size and 692 kA/m of coercivity. Isothermal magnetization remanence and dc-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 perp endicular magnetic recording medium.
    • 基金项目: 国家自然科学基金(批准号:50301002)和北京市科技新星计划(批准号:H020821290120)资 助的课题.
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  • 文章访问数:  6692
  • PDF下载量:  816
  • 被引次数: 0
出版历程
  • 收稿日期:  2004-12-10
  • 修回日期:  2005-01-06
  • 刊出日期:  2005-04-05

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