中国物理B ›› 2007, Vol. 16 ›› Issue (10): 3080-2086.doi: 10.1088/1009-1963/16/10/043

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

The electron transport characters in a nanostructure with the periodic magnetic-electric barriers

卢建夺, 邵 亮, 侯阳来, 戴厚梅   

  1. Department of Applied Physics, Wuhan University of Science and Technology, Wuhan 430081, China
  • 收稿日期:2007-01-21 修回日期:2007-03-02 出版日期:2007-10-08 发布日期:2007-10-08
  • 基金资助:
    Project supported by the Scientific Research Fund of Hubei Provincial Education Department (Grant No 080043).

The electron transport characters in a nanostructure with the periodic magnetic-electric barriers

Lu Jian-Duo(卢建夺)†, Shao Liang(邵亮), Hou Yang-Lai(侯阳来), and Dai Hou-Mei(戴厚梅)   

  1. Department of Applied Physics, Wuhan University of Science and Technology, Wuhan 430081, China
  • Received:2007-01-21 Revised:2007-03-02 Online:2007-10-08 Published:2007-10-08
  • Supported by:
    Project supported by the Scientific Research Fund of Hubei Provincial Education Department (Grant No 080043).

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摘要： This paper detailedly studies the transmission probability, the spin polarization and the conductance of the ballistic electron in a nanostructure with the periodic magnetic-electric barriers. These observable quantities are found to be strongly dependent not only on the magnetic configuration, the incident electron energy and the incident wave vector, but also on the number of the periodic magnetic-electric barriers. The transmission coefficient and the spin polarization show a periodic pattern with the increase of the separation between two adjacent magnetic fields, and the resonance splitting increases as the number of periods increases. Surprisingly, it is found that a polarization can be achieved by spin-dependent resonant tunnelling in this structure, although the average magnetic field of the structure is zero.

Abstract: This paper detailedly studies the transmission probability, the spin polarization and the conductance of the ballistic electron in a nanostructure with the periodic magnetic-electric barriers. These observable quantities are found to be strongly dependent not only on the magnetic configuration, the incident electron energy and the incident wave vector, but also on the number of the periodic magnetic-electric barriers. The transmission coefficient and the spin polarization show a periodic pattern with the increase of the separation between two adjacent magnetic fields, and the resonance splitting increases as the number of periods increases. Surprisingly, it is found that a polarization can be achieved by spin-dependent resonant tunnelling in this structure, although the average magnetic field of the structure is zero.

Key words: magnetic nanostructure, spin polarization, resonance splitting, wave-vector filtering

中图分类号:  (Electronic transport in nanoscale materials and structures)

  • 73.63.-b