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

页码：188 / 192

页数：5

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