Fabrication of periodic arrangement of ferromagnetic nanoparticles as a potential application to future high density magnetic strage media

铁磁纳米颗粒周期性排列的制造作为未来高密度磁存储介质的潜在应用

• 批准号: 13555189
• 负责人: HIROTSU Yoshihiko
• 金额: $ 8.9万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13555189/
• 关键词: substrate with atomic step; magnetic nanoparticles; periodic arrangement; Iron-Platinum; hard magnetic property; L1_0 super structure; electron microscope; Lethography using Polystyrene Sphere; 粒子規則配列; FePd; 基板原子ステップ; 高分解能電子顕微鏡; エピタキシャル成長; ナノ

In this study, we have examined a fabrication of periodically arranged ferromagnetic nanoprticles by using atomic, steps and lithography with polystyrene spheres for potential applications to future high density magnetic storage media. As a result, periodic arrangement of 4-nm-sized Feet nanoparticles was successfully produced by electron beam deposition onto an off-angle NaCl (001) substrate. Fabricated Feet nanoparticles were single crystalline with tetragonal L1o ordered structure just after the deposition at 673K.This fabrication temperature is more than 100K lower than that of previous reports. Magnetic coercivity decreased with decreasing the particle size of Feet, which can be explained by the thermal fluctuation of magnetic moments of very small Feet nanoparticles. Then we prepared Si(113) and SrTiO3(001) single crystal substrates with fine atomic steps. Deposition of noble metal elements like Au, Ag, Pd, Pt onto these step substrates resulted in formation of fine metal nanoparticles with high density, but periodic arrangement of nanoparticles along the step edges were not achieved in spite of the existence of periodic atomic steps on each substrate surfaces. Lithography technique ~ using periodic arrangement of polystyrene spheres lead to formation of Au and Pd nano-dot periodic arrays on MgO substrates. Our next step is to control the distribution of polystyrene spheres on the substrate

在这项研究中，我们已经研究了制造周期性排列的铁磁纳米颗粒通过使用原子，步骤和光刻与聚苯乙烯球的潜在应用，未来的高密度磁存储介质。结果，通过电子束沉积在斜角NaCl（001）衬底上成功地产生了周期性排列的4 nm尺寸的Feet纳米颗粒。在673 K下沉积后，制备的Feet纳米粒子为单晶结构，具有四方L10有序结构，比以往报道的制备温度低100 K以上。磁性随Feet颗粒尺寸的减小而减小，这可以通过非常小的Feet纳米颗粒的磁矩的热涨落来解释。在此基础上，制备了具有精细原子台阶的Si（113）和SrTiO_3（001）单晶衬底。将贵金属元素如Au、Ag、Pd、Pt沉积到这些台阶基底上导致形成具有高密度的精细金属纳米颗粒，但是尽管在每个基底表面上存在周期性原子台阶，但是没有实现纳米颗粒沿着台阶边缘的周期性排列。光刻技术-使用周期性排列的聚苯乙烯球导致形成Au和Pd纳米点周期性阵列在MgO衬底上。我们的下一步是控制聚苯乙烯球在基板上的分布

项目成果

K.Sato, B.Bian, Y.Hirotsu: "L1_0 -type ordered phase formation in Fe-Au nanoparticles"Japanese Journal of Applied Physics. 41. L1-L3 (2002)

K.Sato、B.Bian、Y.Hirotsu：“Fe-Au 纳米颗粒中 L1_0 型有序相的形成”日本应用物理学杂志。

K.Sato, T.Kajiwara, M.Fujiyoshi, M.Ishimaru, Y.Hirotsu, T.Shinohara: "Effects of surface step and substrate temperature on nanostructure of L1o-FePt nanoparticles"Journal of Applied Physics. 93(10)(in press). (2003)

K.Sato、T.Kajiwara、M.Fujiyoshi、M.Ishimaru、Y.Hirotsu、T.Shinohara：“表面台阶和基底温度对 L1o-FePt 纳米颗粒纳米结构的影响”应用物理学杂志。

K.Sato, B.Bian, Y.Hirotsu: "Fabrication of oriented L1o-FePt and FePd nanoparticles with large coercivity"Journal of Applied Physics. 91(10). 8516-8518 (2002)

K.Sato、B.Bian、Y.Hirotsu：“具有大矫顽力的定向 L1o-FePt 和 FePd 纳米颗粒的制备”应用物理学杂志。

K.Sato, Y.Hirotsu: "Structure and magnetic property changes of epitaxially grown L1o-FePd isolated nanoparticles on annealing"Journal of Applied Physics. 93(10). 6291-6298 (2003)

K.Sato、Y.Hirotsu：“外延生长的 L1o-FePd 分离纳米粒子在退火时的结构和磁性变化”应用物理学杂志。

K.Sato, B.Bian, Y.Hirotsu: "L1_0-type ordered phase formation in Fe-Au nanoparticles"Japanese Journal of Applied Physics. 41(Part2, 1A/B). L1-L3 (2002)

K.Sato、B.Bian、Y.Hirotsu：“Fe-Au 纳米粒子中 L1_0 型有序相的形成”日本应用物理学杂志。