中国物理B ›› 2004, Vol. 13 ›› Issue (11): 1962-1964.doi: 10.1088/1009-1963/13/11/036

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Thermally-assisted tunnelling of magnetization in (Mn0.96Cr0.04)12-ac

何伦华1, 曹慧波2, 王芳卫2   

  1. (1)Department of Physics, Fudan University, Shanghai 200433, China; State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; (2)State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • 收稿日期:2004-05-09 修回日期:2004-06-03 出版日期:2004-11-20 发布日期:2005-06-20

Thermally-assisted tunnelling of magnetization in (Mn0.96Cr0.04)12-ac

He Lun-Hua (何伦华)ab, Cao Hui-Bo (曹慧波)b, Wang Fang-Wei (王芳卫)b   

  1. a Department of Physics, Fudan University, Shanghai 200433, China; b State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2004-05-09 Revised:2004-06-03 Online:2004-11-20 Published:2005-06-20

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摘要： The thermally assisted resonant tunnelling in a single crystal (Mn$_{0.96}$Cr$_{0.04}$)12-ac is studied in this paper. The obtained hysteresis loops at seven different temperatures between 1.8 and 3K show obvious dependence on temperature. The magnetization steps occur at specific field values of $nH_{\rm R}$ with $H_{\rm R}$≈0.46T, which are approximately independent of the temperature. As the temperature decreases, the area enclosed in the hysteresis loops and the actual number n of the resonances increase, which provides clear evidence of thermally assisted resonant tunnelling in (Mn$_{0.96}$Cr$_{0.04}$)12-ac.

关键词: quantum tunnelling, thermally assisted resonant tunnelling

Abstract: The thermally assisted resonant tunnelling in a single crystal (Mn$_{0.96}$Cr$_{0.04}$)12-ac is studied in this paper. The obtained hysteresis loops at seven different temperatures between 1.8 and 3K show obvious dependence on temperature. The magnetization steps occur at specific field values of $nH_{\rm R}$ with $H_{\rm R}$≈0.46T, which are approximately independent of the temperature. As the temperature decreases, the area enclosed in the hysteresis loops and the actual number n of the resonances increase, which provides clear evidence of thermally assisted resonant tunnelling in (Mn$_{0.96}$Cr$_{0.04}$)12-ac.

Key words: quantum tunnelling, thermally assisted resonant tunnelling

中图分类号:  (Tunneling)

  • 73.40.Gk
75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects) 03.65.Xp (Tunneling, traversal time, quantum Zeno dynamics)