中国物理B ›› 2009, Vol. 18 ›› Issue (11): 5061-5065.doi: 10.1088/1674-1056/18/11/075

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

The effects of current-path patterns on magnetotransport in spatially-confined structures by Monte Carlo simulation

伍建春, 孙华, 李振亚   

  1. Department of Physics and Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou, 215006, China
  • 收稿日期:2009-03-28 修回日期:2009-04-20 出版日期:2009-11-20 发布日期:2009-11-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10774107, 10874126 and 10804080) and the Doctoral Program of High Education of China (Grant No 20060285003).

The effects of current-path patterns on magnetotransport in spatially-confined structures by Monte Carlo simulation

Wu Jian-Chun(伍建春), Sun Hua(孙华)†, and Li Zhen-Ya(李振亚)   

  1. Department of Physics and Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou, 215006, China
  • Received:2009-03-28 Revised:2009-04-20 Online:2009-11-20 Published:2009-11-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10774107, 10874126 and 10804080) and the Doctoral Program of High Education of China (Grant No 20060285003).

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摘要： Simulations are performed on clusters of finite size to study the effects of size and current-path structure on magnetotransport in spatially-confined samples. Magnetotransport networks are established and calculated based on fractal structures including Koch curves and percolation backbones extracted from regular lattices. The structure pattern of clusters is shown to play an important role in the magnetotransport behaviours by affecting the magnetoresistance fluctuations due to spin disorder in the systems of small size, which suggests the possibility of controlling the magnetotransport by the design of current-path configurations.

Abstract: Simulations are performed on clusters of finite size to study the effects of size and current-path structure on magnetotransport in spatially-confined samples. Magnetotransport networks are established and calculated based on fractal structures including Koch curves and percolation backbones extracted from regular lattices. The structure pattern of clusters is shown to play an important role in the magnetotransport behaviours by affecting the magnetoresistance fluctuations due to spin disorder in the systems of small size, which suggests the possibility of controlling the magnetotransport by the design of current-path configurations.

Key words: magnetoresistance, percolation, magnetotransport network

中图分类号:  (Magnetotransport phenomena; materials for magnetotransport)

  • 75.47.-m