Dynamical Monte Carlo investigation of spin reversal and nonequilibrium magnetization of single-molecule magnets
文献类型：期刊论文
| 作者 | Liu, GB ; Liu, BG |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2010 |
| 卷号 | 82期号:13 |
| 关键词 | DIFFUSION SURFACE GROWTH NANOMAGNETS SPINTRONICS TIME |
| ISSN号 | 1098-0121 |
| 通讯作者 | Liu, BG: Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China. |
| 中文摘要 | In this paper, we combine thermal effects with Landau-Zener (LZ) quantum tunneling effects in a dynamical Monte Carlo (DMC) framework to produce satisfactory magnetization curves of single-molecule magnet (SMM) systems. We use the giant spin approximation for SMM spins and consider regular lattices of SMMs with magnetic dipolar interactions (MDIs). We calculate spin-reversal probabilities from thermal-activated barrier hurdling, direct LZ tunneling, and thermal-assisted LZ tunnelings in the presence of sweeping magnetic fields. We do systematical DMC simulations for Mn(12) systems with various temperatures and sweeping rates. Our simulations produce clear step structures in low-temperature magnetization curves, and our results show that the thermally activated barrier hurdling becomes dominating at high temperature near 3 K and the thermal-assisted tunnelings play important roles at intermediate temperature. These are consistent with corresponding experimental results on good Mn(12) samples (with less disorders) in the presence of little misalignments between the easy axis and applied magnetic fields, and therefore our magnetization curves are satisfactory. Furthermore, our DMC results show that the MDI, with the thermal effects, have important effects on the LZ tunneling processes, but both the MDI and the LZ tunneling give place to the thermal-activated barrier hurdling effect in determining the magnetization curves when the temperature is near 3 K. This DMC approach can be applicable to other SMM systems and could be used to study other properties of SMM systems. |
| 收录类别 | SCI |
| 资助信息 | Nature Science Foundation of China [10874232, 10774180]; Chinese Academy of Sciences [KJCX2.YW.W09-5]; Chinese Department of Science and Technology [2005CB623602] |
| 语种 | 英语 |
| 公开日期 | 2013-09-17 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/36274]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Liu, GB,Liu, BG. Dynamical Monte Carlo investigation of spin reversal and nonequilibrium magnetization of single-molecule magnets[J]. PHYSICAL REVIEW B,2010,82(13). |
| APA | Liu, GB,&Liu, BG.(2010).Dynamical Monte Carlo investigation of spin reversal and nonequilibrium magnetization of single-molecule magnets.PHYSICAL REVIEW B,82(13). |
| MLA | Liu, GB,et al."Dynamical Monte Carlo investigation of spin reversal and nonequilibrium magnetization of single-molecule magnets".PHYSICAL REVIEW B 82.13(2010). |
入库方式： OAI收割
来源：物理研究所
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