A stochastic model for magnetic dynamics in single-molecule

被引：1
|
作者：
Lopez-Ruiz, R. [1 ]
Almeida, P. T. [1 ]
Vaz, M. G. F. [2 ]
Novak, M. A. [3 ]
Beron, F. [1 ]
Pirota, K. R. [1 ]
机构：
[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP, Brazil
[2] Univ Fed Fluminense, Inst Quim, BR-24020150 Niteroi, RJ, Brazil
[3] Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, RJ, Brazil
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2016年 / 403卷
基金：
巴西圣保罗研究基金会;
关键词：
Single-molecule magnets; Stochastic processes; Tunneling magnetization reversal; RELAXATION; MN-12-ACETATE; BEHAVIOR; ORIGIN; STATE;
D O I：
10.1016/j.jmmm.2015.11.070
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Hysteresis and magnetic relaxation curves were performed on double well potential systems with quantum tunneling possibility via stochastic simulations. Simulation results are compared with experimental ones using the Mn12 single-molecule magnet, allowing us to introduce time dependence in the model. Despite being a simple simulation model, it adequately reproduces the phenomenology of a thermally activated quantum tunneling and can be extended to other systems with different parameters. Assuming competition between the reversal modes, thermal (over) and tunneling (across) the anisotropy barrier, a separation of classical and quantum contributions to relaxation time can be obtained. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：188 / 192
页数：5
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