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
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
AbstractThe 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.
Received: 09 May 2004
Revised: 03 June 2004
Accepted manuscript online:
(Tunneling, traversal time, quantum Zeno dynamics)
Cite this article:
He Lun-Hua (何伦华), Cao Hui-Bo (曹慧波), Wang Fang-Wei (王芳卫) Thermally-assisted tunnelling of magnetization in (Mn0.96Cr0.04)12-ac 2004 Chinese Physics 13 1962
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