Excitation Dynamics of Random Magnetic Systems

随机磁系统的激励动力学

• 批准号: 9023107
• 负责人: W. Gilbert Clark
• 金额: $ 21.8万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-09-15 至 1994-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9023107&HistoricalAwards=false
• 关键词: Excitation; Dynamics; Random; Magnetic; Systems

This project is concerned with the dynamics of random magnetic systems consisting of two classes: spin-glasses and random-field Ising magnets. These systems are incompletely understood theoretically and it is hoped the experiments will shed light on the fundamental physics underlying their dynamical behavior. The experiments on spin-glasses wil address the relaxation properties of systems with highly degenerate multiple free energy minima. Temperature cycling is introduced in a new way so that new insights into the movement of the system through phase space can be followed. Experiments on random-field Ising magnets below the transition temperature to experimentally check the predicted the logarithmic growth in time of domains. These results are important in understanding the dynamics of these systems.

该项目与由两个类别组成的随机磁系统的动力学有关：旋转玻璃和随机场磁铁。 这些系统在理论上是不完全理解的，希望这些实验能够阐明其动力学行为的基本物理。 自旋玻璃的实验将解决具有高度退化多个自由能最小的系统的松弛特性。 温度循环以新的方式引入，以便可以遵循对系统通过相空间运动的新见解。 在过渡温度以下的随机场磁铁上进行实验，以实验检查域时间的对数增长。 这些结果对于理解这些系统的动态很重要。