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  1. (西安电子科技大学 机电工程学院,陕西 西安 710071)

  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2005-10-20 发布日期:2005-10-20

The molecular dynamics simulation of an atomic-scale memory based on the double steady-states

JIA Jian-yuan;FAN Kang-qi;WANG Hong-xi;ZHU Ying-min


  1. (School of Electro-Mechanical Engineering, Xidian Univ., Xi′an 710071, China)
  • Received:1900-01-01 Revised:1900-01-01 Online:2005-10-20 Published:2005-10-20

摘要: 采用Morse型势函数对体心立方晶体表面层及近表面层原子的行为进行了分子动力学模拟.模拟结果表明,在体心(次表层)原子操纵前后,体心立方晶体的顶角原子位置只有微小变化,其晶格结构基本保持不变且处于稳定平衡状态,即体心立方晶体具有两态稳定性,该特性为实现原子级的数据存储提供了可行性.同时,对数据存储时可能出现的多原子双稳态组合问题进行了分子动力学模拟,发现在多原子双稳态组合情况下,晶体的结构在操纵其相邻晶格的体心原子时仍保持稳定.提出了一种实现原子级存储的新方式,只需在两个稳定平衡态间激发用于存储数据的体心原子,可以提高数据存储的成功率,保证可重复性和稳定性.

关键词: 分子动力学模拟, 原子级存储, 体心立方晶体, 原子操纵

Abstract: Molecular dynamics simulations were performed to study the atomic behaves in the surface and deeper layers of body-centered cubic(bcc) crystal, with the Morse potential denoting the interactions among the atoms. Results indicate that the bcc crystal remains stable before and after the central atom is manipulated. That is, the bcc cyrstal possesses the property of double steady states, which is capable of representing ‘0’ and ‘1’. At the same time, many-atomed combination of double steady states was investigated by the molecular dynamics simulations method. In the case of the many-atomed combination of double steady states, the bcc crystal still remains stable when manipulating other central atoms. Based on the facts given above, a novel way to achieve atomic-scale memory is put forward, which has the advantages of higher availability, better repetitiousness and stability.

Key words: molecular dynamics simulation, atomic-scale memory, bcc crystal, atom manipulation


  • TN405