中国物理B ›› 2007, Vol. 16 ›› Issue (6): 1776-1779.doi: 10.1088/1009-1963/16/6/050

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Resonant tunnelling of the magnetization in molecular crystal of [(Mn1-xCrx)12O12(CH3COO)16(H2O)4]?2CH3COOH?4H2O (x=0,0.03,0

何光1, 何伦华2, 张俊荣2, 曹慧波2, 阎丽琴2, 王芳卫2, 严启伟2   

  1. (1)School of Physics & Electronic Engineering, The Central University of Nationalities, Beijing 100081, China ; (2)State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • 收稿日期:2006-10-24 修回日期:2007-01-10 出版日期:2007-06-20 发布日期:2007-06-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10505029).

Resonant tunnelling of the magnetization in molecular crystal of [(Mn1-xCrx)12O12(CH3COO)16(H2O)4]$\cdot$2CH3COOH$\cdot$4H2O (x=0,0.03,0

He Guang(何光)a), He Lun-Hua(何伦华)b)†, Zhang Jun-Rong(张俊荣)b), Cao Hui-Bo(曹慧波)b), Yan Li-Qin(阎丽琴)b), Wang Fang-Wei(王芳卫)b), and Yan Qi-Wei(严启伟)b)   

  1. a School of Physics & Electronic Engineering, The Central University of Nationalities, Beijing 100081, China ; b State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2006-10-24 Revised:2007-01-10 Online:2007-06-20 Published:2007-06-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10505029).

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摘要： The quantum tunnelling of magnetization (QTM) in single crystals of the single molecule magnet (Mn$_{1-x}$Cr$_x$)12-Ac ($x$=0, 0.03, 0.04, 0.05) has been investigated. In comparison with its parent Mn12-Ac, a greater rate of magnetization relaxation and a lower effective potential-energy barrier have been observed in Cr-doping samples. This modulation of QTM due to the Cr-doping could be attributed to the small change of $S_z$ due to the smaller spin of Cr itself and additional intrinsic but distributed transverse and longitudinal anisotropy raised by a subtle change of the local environment in the magnetic Mn12 core.

关键词: quantum tunnelling of magnetization, magnetization relaxation, single molecule magnet

Abstract: The quantum tunnelling of magnetization (QTM) in single crystals of the single molecule magnet (Mn$_{1-x}$Cr$_x$)12-Ac ($x$=0, 0.03, 0.04, 0.05) has been investigated. In comparison with its parent Mn12-Ac, a greater rate of magnetization relaxation and a lower effective potential-energy barrier have been observed in Cr-doping samples. This modulation of QTM due to the Cr-doping could be attributed to the small change of $S_z$ due to the smaller spin of Cr itself and additional intrinsic but distributed transverse and longitudinal anisotropy raised by a subtle change of the local environment in the magnetic Mn12 core.

Key words: quantum tunnelling of magnetization, magnetization relaxation, single molecule magnet

中图分类号:  (Macroscopic quantum phenomena in magnetic systems)

  • 75.45.+j
61.72.up (Other materials) 75.50.Xx (Molecular magnets) 75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects)